Sorry to bring this thread up again, but I'm currently working on installing the T3 steering wheel (or to be precise the Golf R steering wheel, which has the same button layout and st-wheel module) in my T1.
The main problem is not the airbag, which can be very easily solved (the method depends on whether you install single, or double stage airbag) but the st-wheel buttons. Of course you can live with the radio buttons not working (you'll have to make the radio louder on the radio unit), but the thing is that in our T1's the onboard computer (MFD) is also steered through the st-wheel! In T3's it's done by the stalk on the st-wheel column! And it would be shame to loose also the whole MFD, wouldn't it?
I'm currently trying to somehow rework the loom/stw control module/button modules trio to make them work with T1 clockspring. Will report in case of any success...