Guys at DD seem to want a flow meter, so I will go ahead with a mold.
There is no big developement costs here, I have been doing this on my own, using parts AVT already developed, and C-Systems has 1000's.
I designed for a cheap two side MUD insert, so no one here will mind if I use one, and even if we only sell 100 of them, that will cover on mold cost