I have a 420 ford industrial backhoe, and I thought about putting a quick change for the bucket to forks or whatever, I changed my mind and just put 3 hooks,(similar to the 4 hooks on your bucket), and use a 1and 1/2 inch steel bar across the top and hung the forks on that, it hooks up quicker than a quick attach as I don't have to get off tractor to hook it up. the down side is I cant see the forks most of the time. they do hang down about 4 inches below the bottom of the bucket, but still cant see them if there on the ground, In any case they are very handy, just yester day neighbor had me load shingles on his roof, so his son didn't have to carry them up a ladder. We are both in our 70s so don't like ladders anyway.
the grapple part , I have a Hyd thumb on the hoe and use it all the time .
Hope this gives you some ideas , Have fun, Stay safe.
Rich