Can you calibrate a 3400k monitor, so it doesn't look orange?

That's like asking if you can make orange look white.

3400K is a very reddish orange shade.

The only way to make the screen look white is to not calibrate to 3400K, but use a bluer color like D55 or D65.

That setting of white point is typically used when video or computer displays are part of a television program set (visible by the camera) which uses studio lighting of that same color temperature. If a normal white point is used for the display on the set, it would look EXTREMELY blue when the program recording is finally viewed. How are you using the monitor?

Best regards and beautiful pictures,
G. Alan Brown, President
CinemaQuest, Inc.
A Lion AV Consultants affiliate

"Advancing the art and science of electronic imaging"

Do you have a link for the software? I've never heard of it.

Then you need to calibrate your monitor for a D65 white point. Your second sentence makes no sense to me. Perhaps you could rephrase the statement.

The point of the software is to simulate sunset.

You can't have a blue sunset.

Either you live with the orange or you disable the software. The software's explicit purpose is to make your screen orange.

The electronic display industry standard recommendation for over a half century to reduce or eliminate eye strain has been: reduce screen brightness when the room is darkened, avoid screen reflections, and implement bias lighting. I haven't ever heard of the science behind the technique described at the link you provided. The consequence of the dramatically lower white point you have already identified. You get to choose which is your preference- sleeping better after late night viewing (I find this questionable), or having all the colors on the monitor seriously distorted.