I think you should just bite the bullet and sell the Allez for whatever you can get, then buy the bike you really want/need. I think you'll be throwing good money after bad with a 650B conversion, and you'll be left with extra brakes and 700C wheels and tires. Plus, those Deore/650B wheels you're looking at are nothing great. Get a proper touring bike, cross bike, or something like that, or even a bike designed for 650B wheels from the outset.