Digital BW, The Print

I've been doing darkroom printing for 20 years and am stumbling
into the digital age (I searched archives here as well as I could 
for these topics but could never get Search engine to survey 
more than a few hundred files [out of 65,000] at a time). . .

1) I just got a new Epson 4000, intending to do BO printing 
(based on satisfaction I experienced with 2200 BO prints; 
not "darkroom-like," but I like the look, esp. for larger 
prints). 

I have not yet installed inks in the 4000 (or even plugged it in!).

Since I only intend to do BO, is it possible to fool the 4000 
into thinking it's a 1-color printer so that I never have to 
load the other 7 carts? (I'm guessing not, but it would save 
plenty of money and hassle if it were.) If it's silly to even 
consider such a notion, please forgive my naivete.

2) Does anybody mix their own inks, or is that a recipe for disaster? 

I ask because the Eboni ink (which I'd planned to use for BO)
looks a smidge neutral/cool to my taste and the Epson black 
(which I used on the 2200) can easily look too warm. (In the 
darkroom I often sought something *slightly* warm; not full 
Ilford "Warmtone," but not neutral either.) I was planning on 
getting refillable carts at MIS and wondered whether there's 
a way to warm up the Eboni a little (I don't think I can buy 
the Epson Black by the bottle).

I know paper affects tonality: I was planning on at least 
for now using Epson UltraSmooth FineArt (mostly because 
I have a bunch of it that I bought for the 2200).

If you think I won't be happy without going the full-ink/
custom-profile/purchased-RIP route, just tell me so.

Thanks for any insights.      

-John-