No disagreement with what you choose to do, just that I definitely could see a professional saying "no, not on my dive" in such a case.
If something bad did happen, and the DM said "well, I expected him to...", he would likely not have a fun time.
My backup reg and gas do get used -- practice
The procedure for self-rescue that you described sounds pretty complex. A BC-off ascent, avoiding out-of-control while breathing by feathering a tank valve, is an interesting concept, one I hope to not have the opportunity to try -- think I'll stick with redundant gas.
(An interesting concept, though, just sounds hairy.)
Apologies if this went slightly off-topic.
If something bad did happen, and the DM said "well, I expected him to...", he would likely not have a fun time.
My backup reg and gas do get used -- practice

(An interesting concept, though, just sounds hairy.)
Apologies if this went slightly off-topic.