The aimtrak automatically installs as a usb mouse/hid in windows, no outside driver needed (and seemingly, no real os requirement? I'd have to imagine it could work on a mac.)
Ideally, you could plug it in over usb and it should show up as a generic usb mouse. The only thing you'd potentially lose out on for the pi is the aimtrak utility for adjusting things such as button assignments, ir gain, and recoil, but I think those settings get saved to the gun's memory internally. You could change them to your liking on your computer and then hook it up to the pi.
Granted I have not tried this but that's my thinking. If generic mouse drivers are robust for the pi it might be worth a shot! The topgun however does require a specialty device driver so slim to no chance of that working out.