Reduce monitor size by adding frame/bezel

[likethevegetable]

My company provided a 30" 2560x1600 monitor, Dell U3023E, and I love the aspect ratio and resolution of it, except 30" is just too big.. boohoo I know. Does anyone know of a way to "frame" or add an artificial bezel to the monitor with black to reduce the size, say to 27"? I can't find anything on the display settings—closest thing is changing the aspect ratio and getting vertical black bars on the sides.. I don't want that though. I would like the "frame" to be forbidden area, no mouse movement or windows allowed to be there.

[Spawnova]

I'm not sure how you would do this with Autohotkey, they only way that I personally know is through nvidia, assuming you have a nvdia gpu you can right click the desktop choose nvidia control panel and follow this

there is probably a way to do it through intel or amd as well, but I'm not familiar