Good idea. Have you tried the bipod out towards the end to check for flex? I know the extended picatinny bar on my Impact has quite a bit of flex if the bipod is further out.
That's a pretty nifty solution. I was wanting to try something similar with my chrony, but I had a difficult time finding the parts I wanted. I eventually came up with something using the Sabre Tactical arca rail, and a short section of picatinny rail mounted through the bottom using tee nuts.