[nafex] rootstocks without grafting?

While looking through the Bailey catalog I see that they offer a number of trees intended to be used as rootstocks for grafting.

Might any of these be grown for their own fruit?

Pear, Old Home x Farmingdale 87 (tree is 61-70% size of common pear)

Pear, Old Home x Farmingdale 97 (tree is 71-90% size of common pear)

Cherry, Gisela 6 (a cross of /Prunus cerasus/ and /Prunus canescens/)

Cherry, Gisela 12 (a cross of /Prunus cerasus/ and /Prunus canescens/)

Myrobalan plum

Myrobalan plum x Peach, Krymsk 86
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