Digital BW, The Print

Perhaps a strange question in an area where everyone, including myself, 
is usually striving for the smoothest print possible: what are the 
possibilities to get a COARSER grain when printing black-only?

I print on an Epson 2100, standard Epson inks, Photoshop CS2 (windows) 
QTR, Ehanced Matte or Phot Rag. For some images I do like the 
graininess when proof-printed on A6. But when printed on A4 the effect 
is to a large extent lost.

I do understand I can add grain in Photoshop, but to me the "modern 
pureness" of the dithering grain has more appeal; different but 
comparable to the "classical pureness" of film grain. I experimented a 
bit with the dithering schemes in QTR but found not too much 
difference. Perhaps I did not find the right approach? Would it be 
possible to switch of the variable dot-size feature in the 2100? Other 
suggestions?