Backhoe Ford 3910 married to a Case D125 backhoe?

[JL Sargent]

Thats what Im trying to do. Im guessing a subframe is the way to go, but how? Backhoe is 1600lbs and base tractor is 4500lbs + FEL. I've included some photo attachments. Im looking for ideas. The tractors FEL presently provides a subframe, so tempted to try a 3pt setup first, but I know its not as good. What do you think? Any and all suggestions appreciated. Been scratching my head on it a day or two now and nothing JUMPS out at me.