Pear tree with quince as pollinator?
Your message didn't appear. I think quince is used as a rootstock on pear trees, but I don't think it is used as a pollinator.
I know nothing about this so I'm open to correction. Look on the RHS site; there they will give the pear pollinators; some pears self-fertile some diploid and some triploid. This is entirely from memory so I suggest you do some research.