First off I am so sorry for your loss. I pray that God grants your strength and peace. Yes; Jesus said that there is no marriage in heaven (Mark 12:25). But that does not mean we lose our love for those we have known here in this world. Our focus, love, and devotion all turn to God – in my opinion at least.
For your husband being baptized and receiving an Apostolic Pardon; could be thought in the parable Jesus told about the “Workers in the Vineyard” (Matthew 20:1-16). Where a farmer hired workers in the morning, then more later in the morning, still more in the afternoon, and yet even more in the mid-evening. When the workers were paid for their labor, each one of them was paid the same amount regardless of when they started working. Some complained and farmer stated each worker was paid exactly what was agreed upon so they should have no issues with what he pays to someone else.
The reason I bring up this parable is that I take it to mean that regardless of when we choose to accept God into our lives and repent of our sins, we also will be paid (accepted) into Heaven. No matter if we were lifelong believers (the morning workers) or later in life believers (near the end of our day as the workers).
It does not lessen the pain of loss but it may bring comfort that your husband accepted God – just like the workers.
May God bless and keep you.