[mkj]

I assume the solokey generates its master key on-device. Seems like it wouldn't be too hard for it to perform Diffie Hellman key exchange with another device to get a shared secret (at first setup) then they could be a cloned pair.

[g_p]

The issue with this would be counter synchronisation, as services shouldn't accept cloned responses when the counter ceases to be monotonic for what should be one single device.