Can I get spot inks that will work with HP Pagewide printheads?

[DKulakowski]

I have some large format, single pass printers. Obviously, reds and some blues are difficult in CMYK.
90% of the work I do is combinations of Red, Blue, Green and Black.
Can I source spot color inks to use in place of CMY (and perhaps a heavier, less transparent black, as well)?
My googling doesn't point me in the direction I am desiring...

I could use Spot Color replacement in the RIP that would change my "Special Red" to 100% M on the fly and if the spot red is in that channel
then I should (in theory) be able to print in spots, no?

 

[J_DVRS]

I think an issue you might run into is the special ink you use might stay in the print head after you are done printing the piece you want. So if you have some left over, and replace the specialty red back to magenta, you might end up with some really funky colors. I am not too familiar with how most wide formats work, I just have a basic Pro 4000s. On my machine it keeps ink the print head I believe.

 

[DKulakowski]

Well, I'm not really looking to switch back- but rather stick with 3 spots and black. Most of our work is red/grn, red/blk, blu/rd and blu/blk.
I have a 2nd digital that would stay CMYK. I just need to know if I can find spot ink for the inkjet... my searches don't turn up anything.