Is there any parallel with the Foxsat "non-Freesat" mode?
Please correct me if I've got it wrong, but my summary knowledge of the Foxsat is that it encrypts recordings, with no decryption available, unless it is operated in "non-Freesat" mode. If the same is true of the 1000s, it is more likely to play (decrypted) recordings from the HDR-FOX than the other way around.
If the 1000s includes DLNA client/server capability, that will go a long way to providing two-way content sharing with an HDR-FOX, and also a route to decryption.