Dave,
Arc makes a AAA with a red LED, it is probably not as dim as you wish though. Dimming a light down is pretty simple to do though, just pour epoxy into the head until it dims it down enough. I would do it in layers as the light absorbing quality of epoxy changes as it dries. Get epoxy that dries to a white color, not the clear stuff.
You can change out the LED on a Madmax to a red from stock white, turn down the adjustment to minimum and see if that will work. My plan for red is change the stock LED out of a Dorcy single AAA light ($6) change it to a red Luxeon just for entertainment. That will make the light brighter which is good for me but not to good for you.
The other option is a CMG Infinity AA light, I hear the red light is rather dim and the battery will run for a looooong time. Good luck!