Right now I don't have confidence to backroll because of all the stuff clipped to my butt, and I'm afraid of climbing the ladder with the weight of tanks hanging off the bungees and sliding oring. I definitely take a disproportionate amount of crew attention and have had a lot of "why the hell am I doing this..." moments
Don't have them in the bungees when you climb up the boat, either use safety leashes clipped to your chest d-rings, or put a small loop of paracord around the valves, and then use a double ender to clip the tanks to your chest d-rings when entering and exiting. When you get in the water you loop the bungees around the valves, and release them before climbing the ladder.
I back rolled with my short hose directly in my mouth, once in the water I did the bungee and ran the short hose around the back of my neck, did my long hose bungee, and then deployed the long hose off the tank around my neck into my mouth.
I'm a Florida style cave diver that did my AN/Helitrox off of boats in the Keys. I have a thread in the tech forum where I described how I did it.