This seems like a great idea! I would also recommend closing the spaces in the links more, so people can copy and pace easier!
And for @Doc, I think he meant that he wanted his community to become public because too many people were inside it anyway, and it became sort of unfriendly and segregative against friendly but not very skilled players.
Overall, I think this is a good idea to let the community join in on your private trains, as the EUNorth2 one is often being trolled and is ineffective. Good luck recruiting more trainers, and I certainly will take a look at the discord!