Monitoring Oxygen Uptake

I went through the AF high-altitude chamber several years ago. One of
the things they demonstrated was loss of color vision with oxygen
deprivation. For those of you who are gurus, would it not be a useful
indicator to have a small color wheel mounted on the panel near the ASI
or Vario as something to scan for safety at high altitude? I'm a
flatlander and don't usually fly above 7K msl. I'm headed for high
country and I wonder about this device. My concern is whether color
vision loss means one is too far gone for this to be a practical tool
for monitoring.