Neil
If I were you I'd contact the hotel and ask them for the phone number of the Secretary and/or Captain of the Dalmunzie Golf Club, which is a completely separate entity. As I think I have mentioned before on this site, the last time I was there coincided with the AGM of DGC and I spoke to several members, who were very proud and enthusiastic about their course. If anybody knows about the actual provenance of the course, he or she would probably be associated with DGC.
Cheers
Rich