Thanks!
That was just the push in the right direction I needed. After heading down a somewhat long and twisty rabbit hole, it turned out that together, OpenTrack and FreePIE were the programs I needed. Didn’t even have to disable vorpX’s head tracking, as the apps added to the inputs rather then replace them.
I’ve still got fine-tuning to do, but I’m a very happy vorpX Skyrim camper.