OP, if you went to the page rustystrings61 linked, did you happen to look around Velomine and maybe notice that they also have single rear 27" track wheels, including one on the wider CR18 rim? If you haven't gone too far on changing your bike up yet - getting one of those would be probably be the simplest way to singlespeed your bike.
Or...
I think you may have already bought a geared rear wheel? Then please stop buying more wheels/sets you don't need or understand. You want to make a singlespeed, not fixed, bike right? Then just buy any of the myriad singlespeed kits out there on the google and throw it on that gearie wheel you may already have. Or...you could just buy some spacers & a cog, & save a few bucks.
Have fun, good luck...