For alternative ways to produce your product, when I read your first post, mentioning it is a bottle, I wondered why they haven't used blow molding. But obviously it is not a simple bottle and Mike has already made enough comments about the technique.
I understand your choice of Tritan material...
Imho it is not really difficult part to reproduce if you don't expect TOO low tolerances. An experienced moulder can model it even by manuel measurement. You can just find a plastic moulder in your area.
