I don't have an alternative program to suggest, but there are some workarounds for using redshift.
First, in the config file, you can set the location provider to manual, then specify a lat/lon and it will use that location in its time calculations. I do this on my laptop, and it works well except for when I cross multiple timezones - things are obviously off a bit.
Second, with the caveat that I haven't tried this, it looks like you can also manually set dawn/dusk times in the config, which sounds like what you're after.
See man 1 redshift for more info.
Agreed. Looks like a variegated carpet beetle.