There are hundreds of useful shortcut keys, and finding them in a map is a difficult task that only gets harder as you add more keys. This doesn’t seem like a great solution to the problem.
Alt in Studio currently doesn’t do anything, maybe it should be used to accelerate ribbon operations and other common tasks, and show location-dependent hints for action hotkeys? This doesn’t solve the issue with more obscure hotkeys, but it seems more usable than a giant map of hotkeys or the shortcut manager.
Windows and Microsoft Office products use alt in the main UI, dialogs, and menus to display hotkey hints and accelerators.
E.g. in Windows menus if you press alt, a letter in the button in the menu is underlined, signifying that it is a hotkey. If you press that letter in this context then that action will happen.
Eg. In Microsoft Office, pressing alt shows these contextual hints that let you use your keyboard exclusively to navigate the ribbon.