Thought I'd send this via PM rather than post on the open board.
I hope you don't think I'm a busybody, but if I read your post right, then you've just advertised to the world (inlcuding GCNP) that you're setting up a situation that violates Park regulations.
The rules require that private trip participants share equally in the cost of the trip. So you've just invited the Park to investigate your trip in order to be sure that everyone is involved is paying their share.
You might want to think about re-posting with a modified offer.