That would be a pretty useful utility to build actually. I can't think of any reason why it wouldn't work unless these wifi adapters don't have the ability to broadcast their own network. Would be fun to give it a try!
Found a guide to do this [0] but without a web interface for configuration, or figuring out if there is a wifi device. Would be easy to setup a script to run on boot to check to see if a wireless network interface is attached, then set up the ad-hoc network accordingly and serve a simple config page. Finally something to do with my pi(s)!