they sell plastic blasting media for aluminum wheels so you are not trying to polish back the blasting grit. Its really sharp stuff, dont let the plastic fool you.
In all honesty, by the time you are done, he could have picked up a pretty decent set of aftermarket wheels and changed the look of his truck. You should charge at least 150 a wheel, for that, replacements win.
Factory Chrysler rims are the worst, I have seen valve stem holes and seats completely disintegrated. The 09 fusion took wire wheeling, plus glue on the bead to finally get them to stop leaking.