Hi Bryan,
yes, this works of course, because your board is just sending the right key codes for this square.
But I don't think, that this is easier than using the PC keys, because you still have to use the PC keyboard for scrolling through this list and pressing [Enter], so you would always have to switch between the PC and your Solus board.

There's one thing about your Solus board, that I still don't understand - in CB-Emu there's a difference for capture moves between devices with pressure sensory boards and (most) magnetic sensory boards:
for pressure sensory boards you need only 2 mouse-clicks for capture moves in CB-Emu (one for the source and the second for the destination square), but if you make the move on your Solus board, you first lift the source piece, then the destination piece and finally put the capturing piece on the destination square.
So in this case the board sends actually 3 events (i.e. key codes) to CB-Emu, but CB-Emu is only expecting 2 clicks!?
How do you solve this problem, i.e. how do you execute capture moves on your board for such a device with a pressure sensory board?

Regards,
Franz