So I'm doing another playthrough, wanted to have two completely OP mages this time. Opened Hall of Secrets at level 4 and xp gapped my two lone wolves.

Vendors are not resetting for the 2nd character's level. Is there a workaround for this?

I mean really, this sort of thing is NOT an issue. I played through the game once normally, now I want to screw around with the mechanics. Patching the systems to prevent this sort of thing is like a car company issuing a recall and then sending out people to take your vehicle whether you want it gone or not.

If I want to do the work to build a completely OP team, what business is that of yours? Screwing this up is directly affecting the replayability of your game.