i seriously only clicked this thread because you wanted to talk about the fact that your pubes where already darker than your head hair NATURALLY, which it is in my case, hence the clicking...
anyway, back to topic; i think that if you really dont like them but still want hair there then why not dye them, if you can be bothered with going through all that trouble to do it every-time the colour grows out. i would suggest, as others have, that you just use regular hair dye to do the job. the hair is usually thicker, more corse etc. so you would need to use regular dye but if you'r still worried then maybe you should try a beard dye first to see if it does the job? they will come in alot less colour options but unless you are thinking of changing the colour to random selections from the rainbow every month, beard dye should be fine.