Damn it where's 7th gear when you need it?!
It can be done but its a little dodgy if you ask me. The B7 multi-function steering wheel uses a twin igniter to set it off whereas the B6 only has one. I think people who have fitted the B7 unit have joined the wiring together for the 2 igniters to get round this issue but the only way to test if this does actually work is to set it off, and i've not yet come across anyone who's actually done this!! Technically speaking if you had an accident and ended up headbutting the steering wheel causing yourself injury because your airbag didnt deploy then i'd doubt your insurance would see this as a good thing!! Personally speaking i'd rather not take the risk. You'd probably even be safer crashing a Nissan Navara!!!
What dash functions were you after by the way? If you want cruise control & DIS you can still have these without the need for the multi-function steering wheel.
A4 3.0 Quattro Sport - Gone & missed everyday!
Current road going missile.....
........Smart Roadster - arguably the most fun you can have in a car without using lube!!