The Colonel and Priscilla

I need to think of roles for Colonel Parker and Priscilla in Elvis: The Legendary Tours

I rather like the idea of Parker as commander of the Royal Guard in the Mystic Land of Grace, Elvis' homeland, obeying the orders of the usurper because it is his duty, but angsting a lot about it, and possibly showing a marked lack of initiative when it comes to dealing with Elvis.

Priscilla is, of course, Queen of the (Mojave) Desert. What I'm not clear on is her relationship to Elvis in this context.

Anyone got any suggestions?