Off-widths at Devils Tower are mostly in the moderate grades. There's one really short 5.10c that I know of to the right of Walt Bailey Memorial. The rest are sub-5.10. Here's a few that get done on occasion:
Devils Delight Direct 5.7 Wiessner 5.7/8 Pseudo Wiessner 5.8 Patent Pending 5.8 Bon Homme 5.8+ (not the popular Horning Variation) Gooseberry Jam 5.9
Tulgey Wood has a very good, long 5.9 fist crack that will be off-width if you have smaller hands.
What about "Intimidation" I think it's a hard 5.9 and it's about 2 or 3 routes right of Durrance.
More to the point, the OP is from Boulder, so the tower would be a vacation for him. Why in the hell would you do something like that when there are so many fun routes on the tower?