Having thought about this a bit more, I think if MN towers will give you your own topic, maybe they could add one of those caveats at the head of each thread reminding everyone not to discuss movements and locations.
If there is any reason for them not agreeing to add a topic, this should be it and it needs to be given careful consideration by everyone involved.
You musn't forget that this is a public forum and anyone can read and post messages here. How do we know they're genuine? We must all be acutely aware of the security risks ever present around us.
Sorry to put a downer on an otherwise cracking idea!