I think the Goerz Dagor was a perfectly symmetrical pair. As my wife would say, a "push me pull you". It shouldn't make a dimes worth of difference which way it's facing.
I'll let someone else answer your other questions......
Leave it that way. What a great conversation starter at the workshops.
What if you get it off and discover it's the wrong flange for that lens and it won't fit, but it would work ok if you glued it on the other end? Sounds like something a photographer would do.