How do the new jobs work in EllinForestPQ?

From what I understand, the players' heads are transformed into the job's corresponding EF npc, and all equips except for those in the Weapon slot are aesthetically changed to match the npc. That's why shields and Kataras don't show up on the player's sprite in EFPQ. As for Wild Hunters and Mechs, I'm sure their mounts work, and Evans are able to keep Mir with them.

You can take this with a grain of salt though, as I don't play KMS.