This might be a fool's errand, but if it's possible, I might want to try it.
My wife recently got a laptop. It spends most of its time as a desktop, where it has an external monitor, iphone, keyboard, and trackball plugged into it. She gets mobile with it pretty regularly though.
Obviously the whole unplug/replug routine gets a little old, and I'd like to minimize the number of things that need to be plugged. It wouldn't be hard to find a bluetooth keyboard, of course, but she's particularly fond of her old Kensington Expert Mouse trackball (she actually has two, so I could experiment on one).
So I started wondering if it would be possible to cannibalize a bluetooth mouse for its transceiver and solder that up to the trackball's USB circuitry…somehow. I'm not afraid of soldering, and I can follow a recipe, but I don't know what I'm doing with electronics.
Of course, even if this is feasible at the hardware level, I have to wonder whether the driver software for the trackball could possibly play nice.
Another option would be a USB hub that allowed USB2 and USB1.1 devices to coexist without dropping all the devices down to 1.1 speed, but I've never heard of such a critter. That would allow the three USB devices to be run through a single port, which would be an improvement.