I have seen home made starters from a piece of radiator hose. Just find the proper diameter to fit on your prop spinner and you're set. You would need to fabricate some type of mandrel to hold the radiator hose though.

I think I am in agreement with everyone else. If you are doing this "because it is there", then have at it. If you are looking to avoid the cost of a starter, then I think you might be wasting your time.

Good luck
Frank