No, as I think I made it too complex with several connections for pressurization, pressure measurement, pressure balancing and I also want to avoid the tread and use a proper flange solution for useful later adaptions!
I really have to try the clamping mechanism!
Ah, I see, that makes sense. I think tri-clamps would be really good, yeah. Not sure how strong a printed flange might be, hence the thoughts on printed parts inside a tri-clamp tube.