I too, was unhappy to hear about the fragility of the sprag (after I bought my bike!). I thought I could manage by just using the kickstart but I find that too strenuous. So, I bump-start down the hill where I live (after first getting it over TDC and in third gear) - always starts easily this way. If I ever do need to use the electric start, I make sure I get it over TDC and with the valve lifter pulled in I hit the starter, let it get up to speed and then release the valve lifter. This takes the stress off the starter motor and prevents a kick-back. I always stop the engine with the valve lifter. I also have 800cc of ATF in the primary. Finally, always ensure the battery is fully charged. I hope with these simply precautions that the sprag clutch will lead a long and happy life.
I think we should have a competition to see who can remove their starter motor assembly and replace it with something more useful and attractive. Perhaps a coffee grinder, a smoothy maker, pencil sharpener etc