Glade Riven
Adventurer
I got to thinking that this could be an interesting dynamic. Sure, a narrator would have to increase the wealth of drops to compensate for XP, and sure, players could buy (maybe) higher tiered magical items at earlier levels, but it would allow for strongholds to be invested in fairly early. And you can end up with a player turning into Batman - reliant on gadgets, wealth, and brains when dealing with Justice League level threats, with the rest of the party having super powers. But the flatter scaling of 5e in general and Adv 5e keeping the same scaling, it would be viable for a rich-but-low-level character to keep up with the higher powered ones if they play it smart.