Since your looking at Texas type of resistance please take a look at this Texas pears - resistance to fireblight
I would go with these types below personally
Ayers
Warren
Orient
Garber
Maxine
Pineapple
Leona
Ts hardy
@mayhaw9999 on this thread many discuss hood like it is fireblight proof which is not the case it is fireblight resistant Hood Pear
Can you bounce my list off Dr. Natelson since he is a friend of yours. Texas is a complexed environment. I point this out because of ayers. Tenn is ayers sibling. They both can have an off flavor in climates they dont care for. Tenn is much more pronounced. I know ayers is a favorite in Texas but if something is better there i dont know about it. I recommend avoiding Tenn unless your like me and you enjoy growing it and it does well for you Tenn pear
These are fireblight resistant and that is not what i recommend in Texas