I feel like the simple hacky solution there is to use Joycons connected directly to the PC for the buttons/thumbsticks. Attach the control inputs to whatever virtual tracking points the vOS app is supplying and voila.
Joycons don't have absolute positioning, only relative, they're not good enough for VR. There is one way you could do it, if you have a Valve Lighthouse setup then you could use Index or Vive controllers, but that would require manually calibrating the two independent tracking systems to align with each other and it's not exactly a cheap solution if you don't already have the gear.
It's a very niche setup, but a few people already use it in order to combine Lighthouse-based body trackers with a non-Lighthouse headset.
> Joycons don't have absolute positioning, only relative, they're not good enough for VR.
The point would be that you don't use them for positioning at all, just buttons/thumbsticks. If you've using a Virtual Desktop-like app on the headset then it's already got positioning from the hand tracking.