At the 2010 ‘Spring Event’ you had a pear scion grafted to a quince rootstock? If so, it should have died shortly thereafter if the scion didn’t ‘take.’ Was this your scion (pear wood) or from the event table? And, was this a quince tree you’d brought in or a one-year quince rootstock purchased at the event?
It’s difficult to give advice without some of those questions answered…
If the quince tree / rootstock is alive and well it can be re-grafted with whatever you’re willing to have placed on it. But I cannot verify the compatibility of your above combination, though most older pear trees were grafted to quince rootstock. I’d actually reversed 'that' graft on my 95 year old Bartlett pear tree by grafting several quince to it
I suspect it was either bad scion wood or a poor graft. And keep in mind, there will be no scion wood at our Fall Event (AAFS) in October …and our array of grafters will not assemble until next Spring