Well, to follow up on this it hasn't worked very well - still have issues with the pinion not engaging completely and had issue with the starter solenoid 'relay' not closing all the way. Was a good idea but doesn't actually work well in practice, should have just gone directly to doing the ring gear and been done with it.
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Anyone know if the Luk single mass flywheel uses the stock ring gear or if it's something I need to get specifically from Luk?