Originally Posted by JYPC

As long as it's not an Italian or French hub, the threading on that hub is 1.37x24 which is standard english which means that you can in fact thread on a track cog. Many people have done such a thing, use some j and b, or some engine locktite too ensure that it won't come off even under intense stress.
Many of the younger kids where I live cannot afford a new wheelset, and/or just want to try the whole fixed gear thing out. So take an old 27" rear free wheel hub and put the track cog on as tightly as possible and it'll be fine. You can always use a bottom bracket lockring on the last few bits of threading to add an extra insurance factor; depending on how many threads that may not work though.