In desert , Bartlett sets fruit better than Bosc, Anjou

Q: I planted a Bosc pear tree seven years ago not realizing it required a second pollenizer pear tree. For several years, I did get a few pears even though the tree had lots of flowers. I think my neighbor’s pear tree was the pollenizer, but it seems to be failing. I have no room to plant a pollenizer pear tree. Not sure what to do.