They did just that in 1989, with the Macintosh Portrait Display [1]. It was designed to fit snugly on the Mac II. Like other CRTs with fixed resolution and refresh rate, the phosphor persistence was perfectly tuned for comfortable, fatigue-free document viewing.
Curiously, tho, I don't think it was a perfect 72dpi like the 9" CRT in compact Macs, so it's not precisely scaled with printed output.