Thanks for that Spike, I am aware of the insurance industry too, but others may not be aware, so good to advise.
I'm sure there would be equal grounds for an insurance issue if the airbag mounted in the car wasn't intended for the vehicle in question as there are many more variables than single or dual, such as trigger priming delay, charge size, charge energy content, bag shape, bag size, seat heights, minimum and maximum wheel distance and wheel angle. An A2's airbag expansion parameters will be different to a TT's which could cause injury or increase burn severity etc if a TT airbag explodes within an A2.
Equally ANY change from original equipment will alter the operation of the cars ACTIVE safety features. Including none AO tyres, tyre sizes, wheel sizes, brake pads, suspension and weight distribution.
The forum should not recommend any changes from OE really.
I haven't fitted the wheel yet so no warning lamp, I first need to work out what the 3 wires do as per my original post.