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Of course. As I said, not for you.
G.U.E. training only scratches the surface on what a diver can achieve; being able to confidently remove doubles below the surface or while floating above the seabed is a valuable skill to acquire. Removing doubles to enter a major restriction would be fraught with danger—sidemount is the correct alternative. One method is to deflate the wing so you float just below the surface, undo buckle and separate crotch strap. Some divers switch to backup, I prefer to stay on the long hose. Remove backup from necklace (free up long hose), take hold of both valves and flip doubles over your head. You should be able to freely remove your arms from the harness. Flip doubles—manifold up, inflate wing. I try to keep things tidy, so I secure belt to buckle, roll up long hose and clip off to shoulder D-ring before passing it up to the canoe, RIB, small boat. The other method is to inflate the wing and lower doubles into the water, jump in with fins/mask on. Place right arm inside the harness then left. Keep regulator in mouth. You may need to readjust inflation. Buckle up. Complete buddy check. The former technique can be used to control a free-flow when using singles.
I dunno, man. I gave your post a Like because I can see how it would be a valuable skill to acquire, and the first video is interesting. But one of the reasons I like GUE is that they feed me the (Kool-Aid?) in easily digestible chunks, in a logical progression. If the time comes when my diving calls for that skill, someone will teach me. In the meantime, they're throwing more than enough at me to keep me busy trying to master it.
Are you offering peeing advice too?
Double 100s/85s, long hose, drysuit, suit gas bottle I can take mine off at the surface in less than a minute. Clipping it to the boat with a tag line then deflating the wing as you lie on your back - it will slide down and off your arms. Hook the left elbow in the strap as it slides past and then reinflate the wing. Be sure to have a keeper buckle for your canister light. Not that difficult but the vast majority of divers have too short chest straps which makes it harder than it needs to be.
I usually also do the doning in the water when we are going to longer trips via RIB, so we dont sit in there fully geared up.
I primarily use a Backplate with a single wing and Al 80. There are times I am in Doubles. And a few times a year in a Drysuit just to stay proficient with their use.
