HI Chuck & welcome
If you have a properly balanced rig you dont need redundant buoyancy. As you know, the key component to proper buoyancy is diving a well balanced rig. In the event of a wing failure, you should be able to swim your rig and hold the stops.
Redundant wings have an array of issues-some that I have personally seen and encountered. These issues are and not limited to another task to manage or task loading, more drag, and another inflator that could stick or leak etc...
I looked at your website and the amount of dives you have done, so you should understand what a well balanced rig is.
Best & dive safe,
A