Bill,
Perhaps there's still a chance for this to be done right: a little
8051/PIC/6805 could translate PC keyboard commands to ASCII serial
(if no menus were in the way) and then we'd have a complete solution.
The "complete solution" is already available thanks to the hard work of
Graeme Zimmer, VK3GJZ. Have a look at:
Requires some soldering though...
73
Johan SM6LKM