I would not give money to non Catholics who are trying to convert others. My experience is with a couple who were very close to me, in fact, at one time before they converted to a non denomination church, they were Episcopalian.
They asked me several times to donate money to them so they could go to other countries to evangelize people. It turns out they were trying to evangelize Orthodox and Catholics, and at one time were in an area where there were many Muslims. They would not evangelize them, only the Orthodox and Catholics. Also they only stayed for a week or two and didn’t speak the language, their guide did the talking. Actually from what she told me it seemed like a vacation rather than missionary work.
I know that there are non Catholics that do evangelize, however, it seems most are converting those who are already Christians, just that they are Catholic.
In the early Church from reading, I find that there were many Catholics who did evangelize non Christian countries and many died for their faith.
Yours in the Hearts of Jesus and Mary