Reddit mentions of #Staymarried: A Couples Devotional: 30-Minute Weekly Devotions to Grow In Faith And Joy from I Do to Ever After

So first off, congratulations man!

Second, I do think some non Christian premarital gay counseling exists, but I'm unsure where.

Third -- and more to your question about what others chose to do -- two of my favorite bloggers are Dave and Tino Khalaf. Their blog is called Modern Kinship. Some stuff they post to Patheos and some of it to their own site, you'll find them.

They've been married just over a year. When they were engaged, they couldn't find any counseling resources for gay christians, so they started their blog both to talk through things intentionally but also to begin building a resource for others. (A few months ago they made a giant resource list on their Patheos page, and their gay Christian marriage resource list is still woefully short.) Some of it is personal and most of it is really rich reflection on gay relationships from a Christian perspective. I highly recommend it. You might even reach out to them directly for suggestions; one of them works for a national organization and might have local suggestions. But also, you might want to do something like this. Both of them are professional writers, so a blog made sense. But you can certainly navigate your own counseling of sorts!

Finally, the Khalafs recommend this devotional book. It is not aimed at gay couples but the authors are affirming and the language of the book may be inclusive. They found it helpful.