Buying an adapter to put a SSQA interface on the 3pt costs more than 3pt or SSQA pallet forks. Pushing a grand or so, crazy expensive to buy or build. I was looking at making one, but never got to it. Ended up finding a 3pt forklift mast with forks in need a little TLC for $200. That ended my quest for a rear adapter.
I welded a used quick hitch to a SSQA plate for the loader. Cost me $100 or so ($300-400 if you get parts new). Love being able to pick up 3pt implements on the loader. Makes moving, loading, maintenance & general handling a breeze. Its also the mount & float hinge for my converted truck snow plow.