Digital BW, The Print

Paul, I am going to do the same as Joost, but for 2200 printer. I will drop MK because I now have new 1400 happily printing with C6 inks. I still have inks from UT7 inkset, could I use UT7-C and UT7-LC instead of LK and LLK as you recommended? It seems to be carbon only inks. I am using QTR only and don't care about compatibility with driver. I also have clear UT base, so I could dilute those inks if needed.
I saw some warning about incompatibility between UT base in C6 base, could I use UT based and C6 based inks at the same time?

Thanks,
Sergei