I might be talking out of my butt on this one so forgive me if I offend any of you on this take:
I think it's fine and all that these 33 miners come and visit Israel. If they are Christian they aren't going to worship in synogogues Christianity. They are going to existing churches wherever they might be in Jerusalem. I doubt these miners have anything against Jews.
In the end of times when the Moshiach comes, in my opinion, righteous gentiles who happen to be Christian will know and pursue what is right in Judaism's eyes whether it is Noahidism or Judaism.
I love our righteous Christian gentiles. Despite our disagreements in theology, you still believe in Gd and good moral things and for me that's sufficient for the time being. I mean we can't agree on everything, right? However, we can work together and discuss our differences respectably.