Sorry to say but I would reverse directions. Put those wheels back on a mtn bike.You're in TO and there's many shops that could find an EA3 rear wheel to fit your bike for 20 or 30 bucks. Try Urbane Cyclist on John Street...Warren Cycle at Queen and Logan (go in and look at wheels hanging from the ceiling, there was a laced AW up there)...the shop in Kensington Market...there's (was?) another on Richmond St, ask a courier for cool shops...another good spot was in the factory on Logan just south of the railway tracks below Gerrard. They're all over that town. I've got an NOS 40 hole endrick for you but it will cost $50 to ship from NS.

PS I've been away for 3 years so the locations may be different but the game remains the same. I think there's more 3 speed hubs in that city than anywhere else outside of England.