It's pretty difficult to build a 5e powergamed character without homebrew or playtest content. I've genuinely never seen a build I'd consider so wildly out of whack from the rest of the party, even concepts people have made, and even then, they require specific magic items.

I'd just give character targeted magic items to the weaker players to bring them to the powergamers par, while rewardinng them with socially interesting magic items then sharpen the teeth to my monsters a little.