Going back to the Personal Lt. route, another option would be to make the giant the PL. If I remember right you said that giants are a servant race in most of your game world. If that is the case you could have the "master" character send his servant along on any quests he doesn't want to mess with himself. I can remember trying to fudge around these issues all the way back to 1st ed. ADnD with players wanting to play minotaurs or centaurs and I don't remember ever having such an eay built in fall back as PL. Would have been nice back then lol
lol such a simple and elegant solution that never even occurred to me.