Yes. You could buy the wheelset, a fixed rear hub, and correct length spokes. You could then unlace the rear wheel and build the rim to your fixed hub with your new spokes. Finally, you could try to sell the take-off rear hub.
I think your idea is terrible. You're throwing money down the drain, especially if you don't build your own wheels. Perhaps this would make sense if you were working off of an expensive wheelset, but I see that the one you specified is only $120. You can easily end up spending that much to perform the conversion. I spent more than that on my rear hub alone when I build my last set of wheels.