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Can you explain why you want a dual bladder singles wing? Don't believe I have ever seen one. I can put together a single tank set up for you but I would not recommend an AIR 2 type device.
How did you decide on the lift capacity?
I have an 11 page article I think you may find useful. PM me your email address as it is too large to send via PM or post here.
I dive wet. The water in Miami is warm the entire year. Most people use a dry suit up north and call it a day. I have to either be a minimalist and keep the total ballast weight to 15 pounds or less so I don't get a heart attack swimming it up, or use a double bladder. I'm not sold on the double bladder idea, but I'd entertain it which is why I put it as bonus (along with the air2).
My my primary idea is to use the SS plate, harness steel rings and accessories, pony, and steel Hp120 to hold me down. That would be around 5 + 2 + 1 + ?. Depends on the tank I haven't purchased yet. I'm piecing it all together. I'd love to see what you wrote. I sent you a PM with my email.