Any chance you would consider an optional piece of flat bar stock welded between the sides of your Quick On Bucket Connector for the mounting of say one of Ken's bolt on hooks or clevis mounts?
It doesn't seem like much of an extra head ache and would be a great place for it.
That way the hook stays on machine and also the bucket can be removed and backhoe used like a small knuckle boom for picking.
I run big iron for a living and we always use the provided ring that is on the quick coupler.
It allows you to remove the bucket and still be able to set manholes, pumps, pipe or whatever. It is also because the ring on the coupler is solidly mounted to stick by the pins. Unlike the ring on bucket that is now relying on the quick attachment points of the coupler.
I'll buy one instantly I promise.