The Bridge does not provide Wireless output.
Actually - yes, it does.
I have pair of AC66U's myself. One setup as a router downstairs, one setup as a bridge upstairs.
The router downstairs runs wireless on both the 2.4 and 5GHz channels, and has a PS3, NAS, and Tivo connected to it via ethernet cable.
The bridge upstairs (meaning the router set into bridge mode of course) ties up the 5GHz channel to exclusively communicate with the router downstairs. It also at the same time has the 2.4GHz channel open, which runs wireless and can be connected to. The bridge also has a computer connected via ethernet cable and a printer connected via USB.
In fact I found it slightly annoying to have multiple 2.4GHz channels in the house so I actually went into the bridge setup and squelched the 2.4GHz SSID on it.
So, Blaq - your setup makes sense to me and yes it is supported.
*Note - I did put the "Merlin Build" firmware on my units, but my understanding is that he does very minimal tweaking to the stock firmware. Want to mention that just in case, though I doubt, it's an option exclusively with his firmware. When mine arrived, I saw that the firmware was out of date, and since I was going to tinker with it anyways I went ahead and gave his a try based on recommendations here).
http://forums.smallnetbuilder.com/showthread.php?t=7715