Installing foo2slx proved surprisingly painless. Of course, I did it the hard way by putting it in /opt rather /usr. Even then, I got the CUPS print page printed in colour in under 10 minutes.
I then did a little calculation. A complete set of toner carts are 220 $ (plus shipping) for 3000 pages. That's roughly 7.25 cents per page. Using Lexmark toner, roughly 15 cents per page. Refilling by the carts by-hand brings it down to 3 cents a page pus my wasted time. So no matter how you look at it, this is an expensive toy. I think I'l put a kitty jar next to the printer to collect money on each print.