How would I go about replacing cracked glass?

Good afternoon all,

So one of my relatives owns a watch that works flawlessly...except for a cracked screen. Well, it's only the glass that is cracked and the screen is good.

That begs the question: could i replace the glass without disposing a display, and if so what would it require?

In case you're wondering, my relative was doing some work and accidentally dropped the watch when putting it on, and it went kapoof.

I won't be doing this anytime soon as i'm very busy but i do plan to have it up and running again in the next few months.

Basically my question is (TLDR version): Would i have to get a whole display assembly or would it be fine to get just the glass as a display is a hell of a lot more than just the glass (It's an SE 44mm Cellular in case that helps somehow).