In my situation, the quince is not hardy enough to survive in my location, unfortunately. I have tried many times. In addition, any area i use dwarfs must be fenced. We will continue to look for the ideal dwarfing pear rootstock that induces early fruiting in pears like shannon, aka Grand Champion, and others. I have not planted shannon because of this. In an ideal climate like @scottfsmith has it is excessively delayed in fruiting. In my area, it might not fruit in my lifetime. Pears like harrow sweet fruit in a year or 2 on any rootstock as @mayhaw9999 mentioned. Hormones are the primary factor of life and reproduction. Girdling and other methods cause a spike in hormones.