For a 24" printer, I would try to find an Epson 7880 in great condition. This would allow you to print K7 MPS glossy and matte.
Right now there are *sometimes* difficulties in applying the GO on newer printers only (7890, 7900, 9890, 9900) apparently because of the PW sensor on these printers only can cause difficulties on certain images when applying the GO (applied in a "second" printing). Changing the orientation of the image seems to help on problematic images in applying the GO. I've been successful most of the time with some workarounds, but you only need one problematic image that you can't get the GO to work (or takes multiple printings to do) to ruin your day.
I'm using a new 9890 that I purchased specifically to convert to K7 piezography MPS glossy and matte. Apparently the 7880/9880 printers do not have the PW sensor problem.
That being said, there is definitely something special about K7 piezography prints, the smooth tones and dimensionality, that mortal inkjet printers like my 9900 can't compete. It's worth the occasional hand-wringing and headache (with the 9890). There is no issue with B&W matte printing, only hiccups with applying GO with B&W gloss prints.
If anyone knows other workarounds or how to disable the PW sensor (without disabling the printer!) please let me know....
ken