OK, seems I'm getting close now.
One final (or probably not) question. If some equipment is hosted by astro PC and some from Pi, would I then need two USB hubs with a cable from both astro PC and Pi or could I route one through the other or how would that work?

Could I omit the Pi all together (for now) and host everything on the astro PC? The Pi sort of lost its pre when I still need a windows PC out there. I could come back to it when/if applicable drivers are developed or if I change out equipment.

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