I think the idea would be to pack the wing in luggage, and build a pack (bag, really, no straps) that would attach to the plate, which you then wear, so that you save the 6lbs in luggage and have a nice small backpack to bring stuff on the plane. It's an interesting idea. There are lots of small backpack companies that would do something like this, although it would not be cheap. Probably the easiest and cheapest thing to do would be to buy an inexpensive daypack, remove the straps, figure out some attachment scheme. Maybe you could even just the existing straps on the pack to just lash it to the plate, maybe add a couple of velcro strips.
To me the easiest thing by far is to simply pack all the dive gear into a lightweight duffle bag. This saves me at least 10 lbs over a heavy rolling suitcase. Dive gear is pretty tough stuff, I might carry the computer on board.