What is the prophecy shell? Epoxy?
Injection molding is expensive, but plastic casting is very affordable. The last time this was brought up, I offered to prototype one in the several hundred dollar range. No takers.
The market share must not be that great, if there are no takers for prototyping that affordable.
Someone mentioned that "front players" might like it because lower capacity would inherently be a tighter setup... No way they'll give up capacity. That's not something any speedballer is willing to do.