You couldn't just pair the device to all of them and then seamlessly switch? The only thing the account is adding is removing that initial step on first pairin

You couldn't just pair the device to all of them and then seamlessly switch? The only thing the account is adding is removing that initial step on first pairing, but even that could be done without an account if the new device C was paired to host A and came in proximity to host B that was in connected at some point with host A.