Digital BW, The Print

I still think someone with a 2200, 4000, or any other 7 ink double K
printer with QTR interested in BO printing shoud try running the light
k parallel with the K ink. Shouldn't be hard to set up at all with
QTR. It should still have the visual qualities of BO printing, with a
more complex dither and less chance of banding because of two inks.
It'll probably be warmer, but once you get it there you could easily
start playing the LM and MC as slight cooling toners. Since K still
runs through the entire scale, it'll still have that look, but maybe
subdued a touch, the presence of the other inks will probably be
slight and not detract.
Tyler