I work at a Trek shop, and will confirm yes, no problem. Especially if the seller has the bag full of frame widgets to convert it to cables. If not, there's a kit you should be able to order, 1 p/n for everything you need to convert it.
Basically, take out the wiring grommets, remove the battery holder; insert cable stops and bb cable routing plate. One of the battery holder mount screws screw into a loose nut -- You will probably need to use a 10mm wrench to hold it, maybe just your fingertips, but make sure it comes out of the bike or suffer mystery rattle. You'll be happiest if you run your cables before you button up the bb, but it's actually not heinous, fishing cables with the bb plate out, even with the crank in place.
Are you getting bb bearings with the deal? If so, and they are used at all, I'd opt to spend $20 on new. They'll need to know brand of crank -- different bearings depending on crank used, Shimano vs SRAM vs Campy.
I know next to nothing. I am frequently wrong.
Last edited by mconlonx; 03-13-14 at 03:40 PM.