Harry

Wouldn’t Talkingcars idea work as a disguised Street drag car. I’ve noticed the front hubs on my Mk2 look ready to accept the Metro drive train (which we never got here in Oz) but if that is true simply attach a direct drive motor in the middle after removing the tinware that houses the spare, upgrade to a 150 Ah lithium ion battery and presto AWD drag car.
The ICE motor pushes from the rear removing the need for the electric reduction gearbox usually necessary for an electric motor to start off and then bingo full electric power available for next 6 or 7 seconds with ICE boost.
Battery recharges from ICE alternator and ready to go again. My caravan lithium will take 50 amps if half discharged so although some smart DC to DC charger will be necessary these are less than $A300.
It would certainly be a surprise for a Z4