Would this be that much more efficient than simply using the navigator preview window? (I just spin my mouse wheel (or ctrl-/ zoom) and then drag the little viewport around in the navigator preview window - which behaves pretty much like a magnifying glass when I'm checking various spot points in the plan... then zoom out when done.) Particularly if you have a second monitor, make the navigator preview window reasonably large and I think you have what you're asking for?
Karl
One of the forum moderators
AC 27 USA and earlier • macOS Ventura 13.6.6, MacBook Pro M2 Max 12CPU/30GPU cores, 32GB