QTR-Quadtone RIP

I was wondering if you could use QTR to create a profile that would
only use one ink (black, yellow, magenta, whatever).

I am not necessarily thinking along the lines of "black-only" printing
(although "magenta-only" might be interesting), but rather as a way to
purge a particular ink without having to purge all inks.

If it can be done, does anyone have any suggestions on how to do it?
Thanks.