I, too, would stay pure. BUT....before I'd make any suggestions along those lines, I'd want to see a picture of her and her full pedigree. Since she's Kuhaylan, I picture a more muscular, masculine looking horse, typical of the older pure Polish. So, off strain alone, I'd recommend a Dahman or Saqlawi in strain stallion, but really you need to see the horse in front of you and the pedigrees of all concerned.
I liked Ganges very much when I saw him, considered breeding my pure Polish mare to him but never managed to make it happen.