Congrats with your fundies, its always nice to hear of people taking the opportunity to engage in further training, whatever the agency and level.
Certainly fundies is something I've considered, I'm always open to having my basics like fin kicks, trim etc reviewed and improved but at the moment I'm still somewhat of a GUE agnostic. I guess I need to find a GUE person sit them down for a beer and have a long deep chat for me to understand better and clear things up in my head.
Regarding the comments about diving in Asia etc, I do it regularly. I've never had any issues testing my own tanks etc. I always overcome gear setting up by making out that I'm helping them, not to worry about me and generally being friendly.
If they truly insist then I let them do their thing and then if necessary I make adjustments, I've never had real issues anywhere though.