Both Thorne and Chie have lightcycles, so if Chie gets woken up inside Kleio, that's them taken care of. (Thorne's already getting woken up inside Chara.)

Thorne can also summon a single horse, but then we'd have to worry about what the horse would eat.

Maria has an adolescent gryphon who might be able to carry double if the other person is also small enough.