Digital BW, The Print

Aside from Paul, of course, has anyone else tried this?

I've got a second 1280 that I'm going to use exclusively for b&w.  I'm
going to be trying the UT2 inks but am also thinking about making my
own.  I very rarely tone b&w prints and when I do, I get very good
results using my colour printer so am looking at a set of just
black/grey inks.  And I typically do duo or tri toning rather than
just overall sepia/warm or cyan/cool so using a colour printer works
well for that.  In addition to the Eboni Black, I'm considering 10%,
25%, 40%, 55% and 70% black formulations.  The 70% and 55% would go in
the C and M slots.  The 40% would go in the Y slot and the 25% and 10%
would go in the LC and LM slots.  

Creating my own curves isn't a problem and I have a "Zone" chart that
I created to use for testing and creating the curves.  Or I can use
the one off the inksupply.com site.  

Thoughts?  Recommendations?  

Thanks