Many people do, so you should be all good :)

I agree with Shiven and Wishy, but on the other hand, the rules are a bit unclear, for example, I've seen people run brawlers at power levels 1-4, I personally got the WR for Daryll 100 trophies at power 4. I think it's probably a good idea to go back to the rules and maybe specify the max power level you can run brawlers with.

Another thing I'd like to point out is the fact that if power 10 brawlers were allowed, or even 7 with gadgets, then the levels category would be pretty much pay-to-win, and that's not fair in my opinion.

This would be a great category extension I like it