Depending on your video card and/or OS, a high DPI monitor is not necessarily required to test DPI issues. I know that on Windows at least, if you have a NVIDIA or AMD video card, it is possible to set a virtual resolution that is higher than your monitor, and will then be scaled down. You can then change the DPI scaling options to mimic a high DPI monitor.
I don't know whether this is possible on other OS's, or with Intel graphics, but it may be worth a try to see if it's possible.
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