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Never put a relay on an Alfa but I have done the relay retrofit on many rear engine Volkswagons. Volkswagon in their infinate wisdom ran a 16ga wire from the front of the car to the rear to operate the starter sol. The resoult was low voltage in the circuit which eventually led to starter & ign switch problems.
I would leave the wiring & ignition switch in tact. The process that I used is use the original wiring to activite a small relay that I would mount near the starter. I would use a 10ga wire to tap power from the batt terminal on the starter sol and then run another 10ga wire from the relay to engage the starter sol. That solved many problems on those cars.
On the Alfa placing a relay near the starter and running wires between the starter and relay should be easy. I would use the original starter switch & wire to operate the relay 1st before digging into the harness. It may work out great without any modification to the original wiring harness.
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