An option to streamline 2.X so it can be run through over a weekend of semi-determined play would be alright, maybe even make it the default and have an NPC knocking about who can activate 'archive' mode or 'new game+' for people who want to run through the entire story in its original form.

A paid for leveling potion that skips huge chunks of story is a terrible idea. Paying for levels is bad full stop actually.