"It's difficult to buy a square desktop monitor these days too."

Actually, it's quite simple - here is a 27" 1920x1920 square monitor you can buy on amazon:

https://www.amazon.com/FlexScan-EV2730QFX-Monitor-1920x1920-...

I have one and I think it's great. I actually prefer splitting a 16x10 monitor into two halves, but the perfectly square monitor is great for diagnostics/monitoring where I can split it into four equally sized quadrants and see four things at once...