Mcmessiers almanac of 1892 refers to 'highland haggis farming, grasses and seeds', page 432 is interesting, you could try that, salt does indeed causes immaciation in the kits (according to dr j.b. mcready, haggis and their environs, 1899' p 125' table 4, I prefer the wild ones however, and the hand spun blue wool/ sweet corn method is one of y favourites