i haven't done it, but i know most disc brakes have a universal distance from the center of the hub. i don't know for sure what that distance is, but a rough measurement of my own disc hub with a caliper gives me 46mm... which would probably be a 47mm chainline with the thickness of a cog.

the standard track hub chainline is 42mm, and the issue is usually getting a crankset and BB to match that. i know paul hubs have a 46mm chainline. i have a set and they work fine with a slightly longer spindle BB... you should be able to do the same with your hub.

this is, of course, if you can find a bolt-on cog... i know i've seen them, but i don't know if they were manufactured for such an application or just drilled out.