Since it doesn’t look like anyone is going to answer your question and I think I know the reason: Rotax starters hardly ever fail. I’ve had one failure in 5 or 6 years of running Rotax and it’s likely most other Rotaxians have had the same experience. It’s not like the other TaG motors, which are mostly non-TaG, what a joke.
I wouldn’t nut start it because it may not have been designed for it and also, I heard that putting a hole in the side pod was not totally Rotax compliant.
I have a starter but have never started the Rotax with it.