I'm starting a weekly campaign at my LGS that is open to anyone so we don't have to wait for everyone to be available to play. To allow for the maximum number of players possible so I won't have to turn anyone away, I'm considering allowing the rebels to use the skirmish deployment card of an unused hero (none of the actual allies like Han or Luke) as an ally, with normal ally rules, although I'm probably going to give them a flat +3 hp bonus since they can't rest and don't have a wounded side.
And also give them their skirmish command card as a single-use upgrade. You would just need to errata Mak's command card to "Imperial class cards".
Has anyone else tried this method for adding hero players? I know about the 2-player empire method, but I like having another option if nobody wants to share the Empire or if somehow 6 other players show up to play on one night.