I would not give up on finding the 10 folks you need to get these going.
You should renew your old thread on Pinside asking folks again who wants plastics and also post on RGP. Maybe Fall/Winter here would be best to launch again as it will be Pinball season here in a couple months as folks will be done with their Summer fun.
If you got 3 more on Pinside and 5 on RGP you would be set. Then just send Lee the links to both threads with the responses and you should be good to go with him.
I did the same with the Williams Klondike plastics and got a 50/50 response from both sites to get my 10. As soon as Lee gets the right mold for the Slot Wheel plastic then the sets will be available to the public.
I'm pretty sure that if you hit the guys hard that you will find 10 folks for Lawman Plastics. Looks like a real fun game and I would not mind owning one.