Again, unfortunatley not,

It's similar to the logic that I've previously tried, but the tiles rotate only around pan and roll, tilt needs to remain at 0. Variations of changing tilt to roll I've tried still causes problems.

With what you've sent, and minusing 90 from tilt gives:
,
but I was still unable to find a way to get sorted from here, and changing the camera tilt no longer 'locks' their position.

Your assumptions 1 and 2 are right.