You'd have to make sure the linkages are not conductive and there is not even a 1mm clearance on their ports in the enclosure. Non-metal axles are possible but it's hard to find material that would withstand the torque.
You also need to think through your cooling solution. Enclosed batteries, converters and motors will generate a lot of heat over typical mission, and you don't have the benefit of direct air cooling anymore.
How about using a metal axle that penetrates the cage using an intentionally conductive bearing, i.e. a slip ring? It would need very low RF impedance, but it would only need to last for the expected lifespan of the drone.
At just a few GHz, metal mesh ought to be adequate for the cage material, so cooling isn’t necessarily a huge problem.
You also need to think through your cooling solution. Enclosed batteries, converters and motors will generate a lot of heat over typical mission, and you don't have the benefit of direct air cooling anymore.