vive trackers you can bolt to dedicated shoes. Using 1.5Ah AA batteries should double the life of the trackers.
I would highly suggest you get the cheapest tap and die set you can find (harbor fright, you're tapping plastic so they'll do).
I've included the bolts as an stl but they'll need the die run on them, though I suggest you just purchase them. (McMaster Carr part numbers given). I would also suggest making the vive tracker screws plastic (printed) as a sacrificial piece in-case you whack the tracker.
91255A539 2x (stl's provided)
91255A522 4x (stl's provided)
Portable 2 x AA USB Charger