Bettas were bred to fight to the death. Even in sorority tanks with females, it's still iffy getting the group to get along. Heck, even when male and female are in the same tank to breed, it's still very risky (I've had a lot of close calls with spawn attempts). Personally, I wouldn't risk it as it's instinct to fight. They may be a little bit more docile in the beginning but in the end, they are still fighters and have that bred into them (whether they were bred to look pretty for a couple generations or not).
I can't find the link but while I was researching bettas when I was still breeding, I came across an article noting that when two male bettas were placed in a large open area, they still found each other and fought, as opposed to going off on their own and finding their own territory.
I wouldn't risk it, but if you decide to stick with it, I wish you the best of luck.
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