If you want closet friendly why not just setup a bike with quickly removable handlebars and folding pedals and hang it by one of the wheels? Taking a S&S bike in half isn't going to reduce the footprint. With removing the bars and folding/removing the pedals you should be able to get the bike down to about 7" wide.
I wouldn't split a S&S bike after every ride. They just aren't designed for that, you'll be going through a lot of expensive grease on the couplers, and the disassembled package isn't easily handled. I had a S&S bike and they are good if you travel frequently with plain bikes (no fenders or racks) and use the bike for long rides. They don't make sense for most other folding applications.
alex