I'd hazard a guess that when/if flight crew are going to have to start using an iPad/similar EFB device, that it will be a personal issue, if only because leaving them in the blue bag at an outport before the a/c returns to HK, will be a ready source for light fingered cleaners etc.
One way way around the security issue, is for a lockable security container to be available, (similar to the one in the bus cloakroom), where along with the required inflight spare units, they can be left safely once crew deplane from the jet. Clearly key control would need to be closely looked at, or CX could have a combination access to be changed regularly, perhaps new code notified in the confidential NTC every x weeks.
No I do not wish to have a company iPad either.
I certainly wouldn't use it for anything personal even if such an iPad was forced upon me