Digital BW, The Print

I complained previously about variations in UT2 ink tones from the set
I bought a year ago and a month ago and although I'm convinced that my
observation is correct I gave up on convincing MIS of that (they
insist that a year ago I bought UT but the lable on the bottles and my
memory say otherwise). 
My question for Paul Roark is if there is any problem (from a
chemistry point of view) in  replacing the cyan and light cyan in UT2
with magenta and light magenta (they are bluish as oposed to cool
gray) from UT. Using QTR I can mix inks any way I want to, it's the
ink tones that interest me. 
Having just bought a new set of UT2 inks (4oz bottles) I would hate to
spend the same money again for just 2 tones that I need.
Thanks for any input.

Andu