All airbag modules do is check for a resistance down the wires to the airbag unit, replicate the resistance and the module will think that it has an airbag sitting on the end of the ignitor wires so there's no fault for it to display.
Or you can get a time delay relay and juts wire this into the bulb behind the dash 100% solution and job done. But I would suspect that in this instance the wheel air bag may need to be in place for the MoT? Hope you get it sorted.
