No one mentioned Dragonlance yet? That already comes with the "choose from this list of pregenerated characters" shtick.
I mean why not Greyhawk? There is always The Temple of Elemental Evil!
That's already been turned into a computer game once, and really it's dungeon-crawling doesn't seem particularly Larian's style. Seems more like another one to remake in Solasta to me (if someone hasn't already done it).
Dragonlance, like Planescape, with their character driven moral conundrums, seem more like Larian's style. Or even something more modern, like Stryxhaven or Spelljammer.
Most people, I think, when they see Greyhawk, expect something in the old school style - combat focused, gritty, high mortality, expendable PCs. And that needs authors who are into that style of play. Who made Crusader Kings? They might be your people.
