Dungeon Respawning/Multiplayer Advice

Hi all - for the past couple of weeks I've been playing MM6 with the MawMerge Mod and the multilayer mod. There's three of us playing together and it's been a blast.

A fourth player wants to join now, which would be fine but I'm wondering how best to level a new character from 1st. Everyone else is around 30th level.

It was my hope that the dungeons reset as I get a tool tip that they will when I enter, but they don't seem to. I would have used the reset dungeons to get this new player's XP up to where it should be without having to drag them along the later quests, but this doesnt seem like an option.

Just wondering if anyone has any advice as to how to level a 1st level character up to the point of the rest of the party.