The sandal is called 'Fits' by Theresa. They are made in Germany. They have a leather innersole that has metatarsal support and good arch support, and conforms to your feet. In addition, it has a soft, rubbery regular sole so they are not too hard. In addition to my PF pain, I have had inner ankle pain for about six months, which disappeared one day after I started these sandals and has not returned. My only fear is that this is another temporary improvement, as I have had good stretches of 3-4 days in the past, but I have never lasted this long.
So, if anyone needs the support of Birks and a softer sole, give these a try. (I'm hoping this nightmare is finally nearing an end.)