Digital BW, The Print

Wow...is there anything to do with photography, computing, 
printing...etc that isn't the equivalent of arguing religion?

My initial and primary purpose for a printer will be to make large 
digital negatives for alternative print processes (cyanotypes and van 
dykes).
Just about any large format printer will do that for me.
So, the black and white aspect is secondary, and something that I can 
afford to work my way into over time.
Also, I have almost no interest whatsoever in printing color.
I am interested in the piezotone system and their claims that no 
flushing is needed between switching cart sets.  If this is so (is 
it?), I think that may be the way to go.  I can print my negs with the 
standard carts and print b&w from the piezo carts.  If I never master 
the piezo system, then I'm out the cost of those inks and still in 
great shape for my digital negatives.  

Considering that I have no interest in color, and a r1800 should do as 
well with aftermarket dedicated black and white as a R2400 (I 
think???), then I don't see a lot of advantage to the R2400 for me.

So I guess one important question is;
Are piezo carts swapable in the way they say they are?