What if we used the "Caps Lock" button? This button is rarely used for writing or anything in general. The "Shift" key would still allow for capitalization control when typing words too, which in my own opinion is better than loosing the functionality of the "Alt" key from so many important hotkeys in Blender.
On Windows, I manually remapped my "Caps Lock" button as another "Alt", which already increased the functionality of that button for me.

Why not add an more key options to emulate Middle Mouse Button, such as using the "Fn" button for laptop users? Possibly with a dropdown of keys?