I know some pannel mount GSP units have VOR capability (not sure if
its internal or interfaces with transiever). Anyway people make
portable transceivers with VOR, and portable GPS units with VOR
databases but I have yet to see a GPS unit that does VOR. I would
think it would be pretty easy to integrate a transceiver into a
portable GPS. Does anyone make such a beast? I dont care if it ends
up being twice as big.

Unless you can plug it into the ship's VOR antenna, the reception will
stink. Why would you want such a thing anyway ? Use the VOR receiver in
the airplane if the handheld GPS fails to operate.