From the Cummins website:

For many years, pears have been grafted onto quince rootstocks to obtain dwarf trees analagous to apple trees dwarfed on Malling 9. Most varieties of pears are more or less incompatible on most quince clones (but in several instances, including Bartlett on Quince A, expression of incompatibility may ofen be delayed until 8 or 10 years or more in the orchard).

From this website:

Certain cultivars, such as Bartlett, Bosc, Seckel, D'Anjou, and Clapp's Favorite, are incompatible with quince and require an Old Home interstem.

And here:

Matching of isoperoxidase "A" in quince rootstocks and Beurre Hardy pear scion may be associated with a compatible graft combination.

Translation: Beurre Hardy is good for interstem as well as Old Home.

BTW, Old Home goes on hawthorn beautifully. I consider it a universal interstem for pear.

Nice compatible/incompatible table here.

Pyrodwarf is said to be as dwarfing as quince, but zero compatibility problems. LINK

Some self fertile pears are mentioned on this page.

From this site:

DOUBLE-WORKING PEAR CULTIVARS
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The few pear cultivars that are incompatible with quince rootstocks need to be double-worked: a cultivar that is compatible with both the quince rootstock and the selected scion cultivar is used as an "interstock" between the two. The cultivar 'Beurre Hardy' is the most widely used interstock; 'Vicar of Winkfield', 'Pitmaston Duchess' and 'Beurre d'Amalis' may also be used for all pear cultivars that require double-working. These include 'Dr Jules Guyot', 'Souvenir de Congres', 'Marguerite Marillat', 'Williams' Bon Chretien', 'Marie Louise', 'Packham's Triumph' and 'Thompson's'. Two methods of double-working may be used: double chip-budding and double grafting.
Double chip-budding entails carrying out chip-budding two years in succession: in the first year, a scion of the interstock is budded onto a quince rootstock; in the second year, a scion of the selected cultivar is budded onto the interstock on the opposite side. For double grafting the same principle is followed. Graft the interstock onto the quince rootstock in early spring using the whip-and-tongue method. In late winter or early spring, cut back the grafted interstock and graft the incompatible cultivar scion onto the interstock. Alternatively, it may be budded onto the interstock in the summer, following the grafting of the interstock in spring. Remove shoots from the interstock but retain those from the cultivar scion.