I mean, it is based on an MMO, and not every MMO is WoW (again, Log Horizon was also based on an MMO—Everquest, iirc?), but there are still some core design philosophies to abide by. If the class wouldn't logically exist within the game before the transition to isekai, then I'd probably fight it. Things gotta make sense in-universe, y'know?

But yeah, going over it a second time now and I think the rest is fine. No real qualms about anything else, so once we resolve this issue (and you get an image), we're probably good to go.