Looking for a monitor with both 4:3 and Zoom functions - any available?

Are there any current or legacy Dell 20"+ monitors that have a 4:3 display mode as well as a zoom function.  I see that most of the currently sold monitors have the 4:3 mode but no zoom.

One of my older (excellent) Dell monitors (U2410) has an excellent zoom function (in 5% increments) but it only has "Aspect" mode and not a 4:3 mode.

What I want is to display a 720x480 HDMI signal, but scaled to fill the height of the screen and squished horizontally to a 4:3 aspect ratio plus then being able to zoom as necessary.  Are there any Dell monitors that can do this?

PS - what exactly does the 4:3 display option do on modern Dell monitors?