I recommend that, before trying Berry's method, you read the article by Rees. He recommends a metol- only developer containing benzotriazole. Probably a suitable hybrid of the Berry and Rees procedures would give very good results.
compounds that do not possess solubilizing group other than mercapto group or the nitrogen site, such as mercaptooxazoles, mercaptotetrazoles, especially 1-phenyl-5-mercaptotetrazole, benzimidazoles, especially 2-mercaptobenzimidazole, benzotriazole, ...
See also: Render, Coated, Base, Image, Collodion