Nellisir
Hero
A lot of the APs are.
Jade Regent has the caravan rules, Skull & Shackles as ship combat, Kingmaker has kingdom building, Wrath of the Righteous has mythic and mass combat, Carrion Crown has madness, and so on. There's very often a subsystem of mechanic that would need to be converted.
Plus you'd also need to convert the treasure, since PCs need far less gold. And the number of encounters and overall length would need to be watched.
Not insurmountable, but something to warned about. It's not just swapping monsters.
And that's what I get for opening my mouth and pretending to know something about something I've never actually done.
