Campaign challenge mode idea

What if we had a higher level versions of the campaign for those who enjoy the challenge and for later characters you twink out?

Tbh, the challenge would be its own reward for me, but maybe you get more currency during this version of the campaign. This kinda goes in the opposite direction of what people want when they ask for a campaign skip, but it might solve their problem as well, since part of the issue there is that the only loot that's relevant to endgame while leveling is currency.

Just spit-balling here; I came up with this idea while leveling a new character after watching the Clutchcore event. I just had a moment like... 'Hmm, I've been thinking everything needs more health, but that boss survived long enough, right? Oh wait, I haven't equipped any gear.'