Thank you for those kind words. It have been a great build, and very satisfying to see it through.
The Triton shares the same internals as the ECO temp, from what I remember as I researched them before buying the unit. Mine came with a 0.5psi regulator, and as I experimented with the variable pressure unit I intended to use, I decided the EcoTemo did not combust really well above that 0.5 psi. I would say it would work acceptable up to 0.7 psi, but then it was too much heat and burning too rich. So I kept that info and began on the stove. anywhere from 2-3 psi would be needed when I whipped out the big wok for stir fry. So ideal for me a 5 psi variable regulator would be ideal. But I did not find a real good answer with a gauge, so a 0-20 psi was accepted. I then plumed it all hard, but was having issues with cooking while heating water, and ultimately decided the only way this would work would be if I re installed the 0.5 psi regulator inline with the hard plummed line from the bottle and the EcoTemp. That solved the problem as what ever pressure I had going for the 60000 btu burners, the EcoTemp would always work correct. Now I was free to go for 2-3 psi on my big burners.
I think you will find that your triton likes the 0.5 psi so I would try to use the regulator it came with. Most small camping appliances comes with a 0.5 psi unit. The triton is extremely efficient and don't need any more. I suspect your dometic unit will be in the 0.5 to 1 psi range, but you can get that info from Dometic as they are good at getting back to you.
The unit I bought was this one, but that was just because it was available, and had the gauge and SS line.
https://www.amazon.com/gp/product/B07BK11RGY/ref=ppx_yo_dt_b_asin_title_o00_s01?ie=UTF8&psc=1
The more compact stoves as the dometic don't do as well when you increase the propane pressure to cook hotter as compared to the cast iron burner, where you can tweak the flame. That being the case you can hard plum them both from the bottle with each having their stock regulators right before the respectable units. So line from the bottle, and T off to the two units with a regulator for each. Would work fine.
You have another option which is to hard line from the bottle to a dual quick release as I did, but with two different regulators behind each quick release.
I hope I did not confuse you further as it is late, and been a while since I had coffee...
I will circle back tomorrow and see whar ya think.
Regards
Erling