The Z1 website gives "Assembled as a complete unit, the covers are not seperable from the airbag itself." Of course
that may be Z1 playing safe.
https://www.z1motorsports.com/air-bag-sensors-and-control/used-nissan/used-driver-side-airbag-with-cover-p-4118.html
Do you want the '96 FSM pages which cover the Airbag system? It covers the safety aspects of handling the airbag
assembly - in particular not storing and handling the airbag in the "face down" position. In the event of accidental
deployment it would turn the steering wheel into a projectile, sending it up towards the person handling it.
As Andy says, not connecting the airbag connector is perhaps the easier way. Can the two pins in the airbag connector be
shorted together to remove the chance of an electrical discharge setting off the airbag?
The steering wheel cover has "SRS Airbag" on it. What would an MOT tester make of that as far as the warning light function
at start up?