just add a pointer to dos but no other graphics, it should still be possible to run other graphic applications
I don't see why this would not work other then some technical issues (I don't know how make operating systems)
if you're on windows, launch cmd go into fullscreen and try playing gzdoom and you'll get a good taste of what I want.
here's a picture of what I'm imagining:

you're probably asking "Why would anyone make this?"
because dos is fun, it makes me feel like a computer wizard and scares normal people.
now I'm expecting one of you to come up with some obvious problem and completely ruin my imagination