Y'know, maybe it wouldn't be as hard as I'm thinking.

The first boss in Lost City of Amdapor HM had the ability to clone player character's appearances. Other dungeons have had us glamour a few times into monsters or other things like zombies, so we could be glammed into the copied appearance of the other players.

They could then give us the simplified skillset based on the character's job, which they already have several variations of, and while it wouldn't be fully accurate, it'd still give the same effect. Frustration against the unknown, hehe. Just for a short time. Maybe twice in the fight if the group is slow to kill the boss.