I have one like that. I cut the mounting brackets off the bucket and welded them to a SSQA lever assembly. I welded a SSQA plate to the bucket so I could still connect it with the new SSQA levers. The "double" quick attach setup makes attachments stick out a little farther from the original mounting pins, which decreases my lift capacity. But I can now connect any SSQA loader attachment. And sticking out a bit farther does make them easier to see from the seat. I have the original bucket, pallet forks, and and a hay spear, all mountable on the SSQA conversion.
You can see how I did it in the picture to the left.
--OR--
You could fabricate mounting brackets like those on your bucket and weld those to your other loader attachments. Then you could use the original proprietary quick attach hooks. But the modified attachments would never work with SSQA again. They would be married to that particular tractor. You wouldn't lose any lift capacity like I did, though.