Have you considered integration with the buttplug.io libraries? Strikes me that it's the missing piece of the puzzle, so to speak.

I am SO into this idea. I'd urge the devs to consider intiface -> buttplug.io interactivity, especially if they're going down the route of The Divine Engine Pragma and milking/fucking machines. Got a kiiroo onyx+ and I'd like to use it with the best VR game out there.