Keaschall has been brutal in the field, but is still an exciting player to watch. Give him an IF glove this winter and a paid trip to Ron Washington's house, he's done wonders with Arraez. So far his problems have not cost him at the plate, see Eduoard Julien
Keaschall becoming a full-time DH is not the worst thing, though he will have to find a little more power, 25 HR a season or so power. This would also stop the team from taking flyers on washed up veterans in hope they work out, kudos to Josh Bell though, he's been better than expected.
If he becomes playable/passable at 2B, an IF of Lewis at 1B, Keaschall at 2B, Culpepper at SS, and Lee at 3B until Houston arrives should do well enough.