I was going to use the example of a guy I once worked with. I was a punk kid at the time, trying to learn about color - something of a black art at the time. He was an older manager who had sometimes filled in as a color corrector, while the regulars were at lunch or out sick, etc; we did high volume portrait work so there were a lot corrections being called.
Anyway, the company wanted to further quality, and hired an RIT grad in photo science. One of the things he did was to get some tools to evaluate color perception. Surprise! The guy doing color correction had significant color blindness. Yet it never caused problems with his work, evaluating skin tones (although after that they DID tell him he wasn't allowed to do it any more).
So I WAS going to suggest that you might be about to do it too. Except that your color blindness, is probably way beyond his - he didn't even realize it until being tested. So I'm guessing that you wouldn't be able to do it, but I dunno.
I think that I were to lose my color vision (but still have tonal discrimination) I could probably do a good job printing RA4 if I had an instrument that could read what they call "CIELAB" values. (CIE is the long standing organization that deals with colorimetry, and LAB, more properly L*, a*, and b*, is the set of three numbers that roughly define how a "color" would appear to someone with "normal" color vision under, roughly, daylight.) You have to learn a different coordinate system, which is foreign to photographers, but once you do it can be very useful. (I've worked with this a lot and am really confident in the system, within its limitations). Wayyyyy more useful than a densitometer for this purpose. But the equipment is pricy, in the general range of a thousand bucks (X-rite i1 pro is an example).
If you don't like instruments, perhaps an apprentice is your best bet. Best of luck.
