Interesting topic.
Assemblies have always been a bit of an eye opener for me. There are so many rules; usually for the rank and file - as per "do I as I say not as I do".
If you wanted to attend an assembly abroad, you were strongly discouraged from making your own travel arrangements. I can understand if you don't travel with an official party then you cannot be an official delegate. But if you you weren't bothered about the 'delegate' bit and you simply wanted to see another culture then I could never see any thing wrong with that.
When I served in India, there were brothers and sister who had travelled for a day by train. They stayed in a cellar sleeping on a concrete floor. We visited them down there every day and took drinks and goodies for the kids - I never saw the DO, CO or Bethel reps down there though. I guess they were too busy arranging the the assembly for that, no just a minute, I was looking after the attendants, the parking, the washroom and first aid.