Comment by CalRobert

I never found a solution. I ended up using a very red-shifted screen set to a very low light but what I really wanted was e-ink, like a Kindle for instance. The only options I came across were impractically expensive, though. https://shop.dasung.com/products/dasung-25-3-e-ink-monitor-p... for instance, and this was years ago when there were fewer options.