I like the idea but you are limiting yourself on skills. I was thinking it could best be controlled by gear selection.
Say you get two legendarys and everything else is blue(magic gear). This setup could potentially make hundreds of builds viable while removing overpowered sets from the equation. I think this idea would work well with anywhere from 2-4 legendarys.
I have seen similar threads on this topic suggesting that if you were gearing with yellows or blues for these brawls, it would put a lot back into gear hunting. Now you are looking at every item instead of just busting everything blue and yellow without giving it a second look.
The last hurtle is everyone to agree on something.
You make me think about WoW " twink" battlegrounds , which was extremley fun if you wanted to invest time in :).
I'd deff give it a try if there would be some people available to do so too or a community channel.
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Places you can find me theorycrafting and having fun in game at a higher level (or trolling around)