Are you nuts? You're going to not only have a single source/single regulator for dil/deep BO, you're going to go with a single source of O2 too?This.
With scooter I'd get rid of the AL13 and plumb the O2 80 to the chesty to keep clear of the leash. Deep and travel are on long and short hoses ready to deploy from the left, respectively. Nitrox could be lower % for earlier switch on deco. Rich mixes on right, on and isolated. Losing the 10/70 would be an expedited ascent on travel gas.
At some point you're just diving alpine with tots and prayers.