I was wondering if you can take the wiper contact from Fiat marea weekend, and put it in a bravo? with the interval function working properly ?

You would need the switch, the wipermotor itself and then do additional wiring.

For the interval function you could just get aftermarket kit.
Its basically a adjustable timer you plug it to the singe wipe contact.
Velleman K2599 is one, but it does not give much range, looking at the schematic you could replace the switch with potentiometer to get seamless setting.

The stalks fit straight in

so the swap needs some rewiring and motor replacements ?