Why don't you use a 16:9 monitor in portrait mode for DTP? Most printed material is taller than it is wide, so a portrait widescreen monitor will let you see the entire page at once without zooming out so far it is tiny.
You could also just buy a 16:10 monitor. There are plenty of them about. If you feel adventurous you can get 16:10 2.5k screens from Korea very cheaply, and the use the same high end panels as Dell and Apple do. Search eBay for "catleap".