Swap bodies. Keep the frame, running driveline, and axles all under the Ford frame. Put your Jeep body on that. Trim the rear wells for the wheelbase. Sell off the Bronco body for parts for other and probably make back your initial cost.
The Ford frame is much stiffer. The driveline can handle itself as proven it is still running together. Modify the stock radius arms for articulation with extending them as well as putting a rod end on the end. Have fun with it.
The wheelbase of the Bronco is in line with a CJ6/8 length.
97 TJ SE lifted, locked and rubbered for fun
94 YJ SE stock, 225s, Trail Tested