Magnetos ARE permanent magnet alternators, albeit the former are not designed for either energy replenishment to an electrical storage unit nor sole power supply to an extensive electrical bus.
I take is the cost is holding the streetwise adoption or there is something else outside the race realm making this a poor application for the street?
It is likely designed and built with size, weight, effciency and minimal amperage as priorities, but not the long life and associated higher manufacturing costs incurred for the greater output required in other applications. In any case, a PMA provides precious few advantages in an automotive system already laden with a large battery.
It is possible.
The last time I push started a car with a rear pump it was a mid sixties falcon and I pushed it with my 62 6cyl Nova. It took every horsepower the Nova had to get it going fast enough to start it, something around 30 mph as I recall.
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