Last time I looked at getting a standing desk for my office at home, I decided it'd be cheaper to get a third monitor and a second keyboard and mouse. They would go on a permanently-standing-height desk next to my regular desk.
In linux you can reconfigure displays using the `xrandr` command. A keyboard shortcut would then toggle between the two desks.
So I assume you also have a 2nd set of keyboard/mouse with the standing monitor? Regardless, I would much prefer having all three monitors on a large rising/lowering platform.
I don't think $500 breaks the bank here - it's an expensable item, costs less than a high-end smartphone, and probably has much better ROI.
In linux you can reconfigure displays using the `xrandr` command. A keyboard shortcut would then toggle between the two desks.