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"Does anyone know how a spec ECU will cope with Aprilia V4s, inline fours of at least three types.?" @rick65
Easy. Aftermarket ECUs (like PI, Motec etc.) already can handle from singles to 12 cylinders (both 2 and 4 stroke).
There is a just a sync pulse from crank rotation, this gives position and speed, then the injection/ignition is just mapped to this. Simple.