Would the backup utility run in a VM? I don't know how it communicates with the keyboard but I'm guessing it's fairly low level to talk via a PS/2 port and is probably hitting the hardware directly?

Edit: Seems highly unlikely... I'm just a bit of a fan of VMs lately.

What about AutoHotKey and run the macros on the PC itself. It should be capable. I use a very simple one to generate middle mouseclicks on my two button laptop mouse pad.