wondering if you take the entire airbag system from a fiat marea and swap it with the system in a bravo/a. meaning you take passenger airbag, drivers airbag the entire loom and the control unit. is it possible ?

Yes it is

Use the modules, clockspring and wiring.

MickeyBravo has a Marea wheel with working controlls in his HGT

You could put in an Alfa 156 wheel either

will it also work if you take the controllunit and drivers side and passenger side airbags?
if you for example aren't able to aquire the entire loom ?