I'm not sure I really understand the question, so forgive me if my post is off the point.
I think that we must consider that even if man fails, the Holy Spirit can overcome our failures and do miraculous works through flawed human beings and their flawed plans.
My husband and I were evangelical Protestants before we converted, and we could well have laid claim to the title "Super Evangelicals." Evangelical Protestantism is a lifestyle in which much of the time and energy is spent involved with the church. At least 5-6 days a week, my husband and I, along with our two daughters, were at our church or at home working on a project for our church, or "fellowshipping" with fellow church members.
It was only when our daughters started figure skating in their toddler years that we started moving in circles outside of the church. Figure skating introduced us to a whole different world, one that was not always loving and certainly not God-centered.
But many evangelical Protestants never associate with "the world" other than when absolutely necessary; .e.g., in a job setting. But even now, the evangelical Protestants that I know who work in my hospital tend to stay apart from everyone else.
There are many unwritten "rules" that evangelical Protestants follow. Those who do not follow those "rules" are often rejected by other evangelicals as "fallen away" or "carnal." Sometime other evangelicals will "reach out to" those of their fellowship who do not follow the "rules" and attempt to "convert them" to "true Christianity" or convince them that they need to not only accept Jesus as Savior, but also accept and follow Him as Lord. What that really means is that if the person is a "true" Christian, they will automatically follow the "rules."
The rules that I am referring to have to do with certain behaviors, e,g, drinking of alcoholic beverages, theater, dancing, card-playing, movies other than G-rated, any kind of activity on Sundays other than "church," overeating, drinking caffeine, reading secular periodicals and newspapers, television other than Andy Griffith, swimsuits and mixed swimming, etc.
Figure skating and other organized sports is a puzzler for evangelicals. Often, they protest the competitions and games held on Sundays. But in recent years, many evangelical churches have started offering Sat. evening worship services, which make it possible for families to be involved with organized sports. Also, many evangelical Christians teach that church attendance is a "work" and therefore, not required for salvation. And of course, many evangelicals have rejected organized church and now attend home fellowship groups or hold "family church," in which the father is the pastor and his family is his "congregation."
Nowadays, some of the questionable behaviors listed above are being allowed, mainly so that the evangelical will have opportunities to "witness" to non-Christians.
But there are some new rules; e.g., homeschooling or private Christian schools, courtship dating, reading Christian fiction only, etc.
I am being detailed about evangelical "lifestyle" to educate Catholics on the reasons why it is often so very difficult for an evangelical Protestant to convert to Catholicism. It's not just a change of faith practices. It is a rejection of an entire lifestyle.
As for how it can be facilitated by Catholic churches--I think it's happening without Catholics doing anything other than being Catholic.
Many evangelicals have been slow to get involved with pro-life organizations because of fear of associating with Catholics. But now they are on board, and as a result, in recent years, have adopted several Catholic practices into their worship services; e.g., lectio divina, candles, chant, Latin, silence, kneeling, etc.
There is a vocal group of evangelicals that protests these practices, stating that they put the evangelical Christian in danger of getting on the "road to Rome."
And that's the point of my post--I think that a lot of evangelical Christians who have become involved with the pro-life movement are being exposed for the first time in their lives or their family's lives (many evangelicals are mulit-generation) to Catholics and Catholicism, and they are liking what they see.
I believe that God is using this dreadful situation in the U.S. to push evangelical Protestants back to the Catholic Church. If it was not for the abortion issue, many evangelicals would never mix with Catholics.
OP, please keep in mind that for all their failings, evangelical Protestants have a deep love for Jesus Christ, or at least, the Jesus Christ that they have been raised to follow. They also have a fanatical devotion to reading the Bible, and a hunger for righteousness and the truth.
Jesus said that those who seek shall find, those who ask will be given, and those who knock will have the door opened to them. I think that many evangelicals find that as they seek, they are led by the Holy Spirit to the Catholic Church.
Many flee at this point, trying hard to believe that they are being led by something other than the Holy Spirit. It is difficult to overcome the teachings of a lifetime.
But those who don't flee ask--a lot! You've all known converts who drove everyone in the parish crazy by attending every study and class offered, and reading books and getting websites and asking question after question about Catholicism!
And God will answer.
Then comes the knock--the evangelical finally gets to a place where they knock on the Church door and says, "May I come in?"
And the Lord opens.
So please do not underestimate the power of the Holy Spirit to bring converts home.