"There may be large format printers to do CMYKOG"
There are many.
In fact, my own printer (an HPz3100) has even more: it has 12 inks in total, which include M (Magenta) Y (Yellow) PK (Photo Black) G (Grey) LG (Light Grey) LC (Light Cyan) LM (Magenta) R (Red - which is really more of deep orange) G (Green) and B (Blue - richer and more vibrant than Cyan), along with a MK (Matte Black) and a GE (Gloss Enhancer).
(The extra Blacks and Greys are mostly for superior full-range B&W photo printing, but are also used for full colour work)
It's imperative that this be a color-managed workflow and requires RGB data to take advantage of the wider gamut.
(You will notice there's actually no Cyan – Between the Blue ink and the Light Cyan ink, it covers everything a Cyan would do, so it is unnecessary.). I typically send AdobeRGB data and it's gorgeous.
Also, for my design work, the extra inks allow me to print more than 90% of the Pantone library accurately, whereas a typical CMYK printer can barely handle 20%.
In these printers, the "Light" inks are there to alleviate the problem with sthe catter-dot process an ink-jet uses, as the inkjet "dots" are a fixed size, so at the light end of a color gradient (say between 0-5%) theses dots are very obvious and far apart, so the light inks "fill things in" for a much smoother result.
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