Newman, you are very intelligent and what you say makes a lot of sense. It would be best in theory to have the Noahides in complete control of themselves and have Noahide priests but given that the Noahides were obliterated in the past 2000 years as you stated makes such a move risky and would have the same result. I understand now.
Do Noahides have their own congregations? I don't understand why they pray in a Jewish congregation as you suggest. Why would they do this?
Because we are of the same faith. Noachides practice orthodox Judaism. They just do it as it applies to them. Let me explain:
You practice the same religion as a Cohen, but not the exact same way because you have different roles in life.
A Jewess practices the same religion as you but has different rules due to her different role.
Observent Jews are the world's priests. Noachide Chasids are the lay persons. Just as a franciscan monk and Paddy the plumber are of the same faith but have different roles and different rules but still share many.
Therefor it makes sense to pray in Jewish schulls. Perhaps the Rabbis could schedual different services for noachides if there is sufficient demand.
Gentiles can't read Torah aloud in a public forum, so we can't vert well perform our own services.
If all Jews were to make Aliyah, we would make do with private meetings. Presumably there will still be Jewish envoys and Rabbis travelling to the nations as advisors. I don't believe Jews are forbidden to travel outside of EY under Talmudic Law.