Ideally, it would be as simple as just touching them together.
What axis is being conditioned on? Gravity axis? Touch point axis?
How to determine touching? Voltage changes through conductive skin? But then how does wireless data escape?
What happens when both qubits are being rotated at the same time? General user confusion at the not-a-proper-gate result? Perhaps do everything in full precision then drop down to known gates if nearby at the end of the interaction?
Ideally, it would be as simple as just touching them together.