So... This happened. Turns out cheaper than any stock desk/chair mounts. And surprisingly easy to make.
Not crossed that bridge yet, but the plan is to use the extrusion channels, lead the cables to a powered USB hub under the chair and from there just go with one cable to the PCAs awesome as this looks, the question that comes to mind for me is cable management.
Sounds like a good plan. TBH, in my mind, I envisioned that set up for myself & I'd accidentally mess things up by forgetting about the cables while having to get up to take care of something elsewhere urgently. OopsNot crossed that bridge yet, but the plan is to use the extrusion channels, lead the cables to a powered USB hub under the chair and from there just go with one cable to the PC