Hi!
It’s great that you’re doing so much research – I’m convinced that research and time are the key to successful bonding! I also wouldn’t worry too much about it being two boys. I have a trio of two boys and a girl, and the boys just immediately loved each other. It’s more about personality than gender, although a mixed sex couple is supposedly easiest. I’m afraid I don’t know anything about whether previous breeding makes a difference, but once they’ve been neutered, I would hope that it wouldn’t make a long-term difference.
You can definitely start prebonding during the month while you’re waiting for hormones to drain. I would give them a week – 10 days to fully recover from the neuter, then move their cages near to each other (but ensure they can’t touch) and start swapping them between cages. Do this for at least a month, and watch out for how they react. To start with, they’ll probably be very angry. Stomping, peeing and pooping everywhere, throwing things around. But hopefully, they’ll start to get used to each others smell, and after a few weeks, you’ll stop seeing reactions at all. That’s when you’ll be ready for actual bonding (although I recommend at least a month of prebonding, even if you see positive signs earlier). Ideally, you’ll see them mirroring each others behaviour through the cages, but that’s not essential.
For actual bonding, I always start off with a very short session in neutral territory. This can be a bathtub (mine hate the bathtub), a large cardboard box, or a table top. Anywhere they’ve never been before. Put them both in at the same time, and have a thick leather glove or oven mitt ready to separate them if they fight. If you’re nervous, keep your hand between them at first. You can start off with just one or two minutes to see how they do, then do a few two minute sessions a day, gradually increasing the time.
I used the method listed on this site successfully https://binkybunny.com/BUNNYINFO/tabid/53/CategoryID/9/PID/940/Default.aspx
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