Kansas-
At the outset, I must say that I know absolutely nothing about Galloways, other than they are a Bovine Breed! However, from what I have read on their site and other sources, they seem to fill a niche with which other breeds have problems - very cold climates, and managing difficult topography with which to graze a livelihood.
They appear a very solid, structurally correct, and should be good mothers. Because of the preponderance of hair, the phenotype is not too obvious. I question the advisability of crossbreeding because of the hair and other characteristics pertaining to the locality where they were developed. It may disrupt the very traits which make them what they are.
I am afraid that I have not helped you very much regarding the advisability of breeding them. however if you do decide to concentrate on that breed, study the particularities carefully and begin with the best genetics and phenotype you can find and afford - just as you would with any breed.
DOC HARRIS