DiveRite makes a quick connect just for this purpose for the Optima.
Try this link for some info:
SCUBA Diving Equipment and gear for Technical, Wreck and Cave Diving: Dive Rite, Inc - Product Catalog - O2 Bailout Quick Disconnect
I don't know if it will fit the hoses on the Evo. When I had an Inspiration, a number of inflator hoses fit the manual buttons but not all of the ones I tried.
Hope this helps some how.
Nick