Thanks, that's what I figured regarding back mount for boat diving.
The section I bolded is not a thing I have ever seen done here, as the boats are owned by the resorts/dive shops and they have a schedule of 2 60 minutes dives, lunch, then 1 more 60 minute dive.
I think it will be difficult unless you're at one of the few shops that do tech/CCR unfortunately, or you have access to good shore diving here.