[jcalvinowens]

Based only on my own anecdotal experience... I think the hole the cables go through is the biggest problem in OPs setup. I'd solder the shields to the cage circumferentially around the hole. Shielded USB cables aren't too hard to find, it wouldn't be as good as something optical but it's a lot easier.

[127361]

Feed through capacitors for power and use fiber for the rest?

[jcalvinowens]

If power was really the problem I'd just use a battery inside the cage.

Related, this is a neat experiment which powers a galvanically isolated circuit optically using LEDs and a solar cell: https://youtu.be/9JinSfCKuNQ?t=823&si=kBwesUsVgAGBVVwq

He didn't need to block RF though, the interface seems mechanically challenging to build into a cage.