ive just been told that i have pigeon lung and i am useing normal face masks with good results,there are other more expensive ones but i would try the standard ones first.
have had 1or2 the same i tried several ways, but found it best to put cock in a section on his own for up to a week then put the hen in you want him to pair to leave her with him for a couple of hours them take her out do this for a couple of days should work,