If you have the Developer tab showing on your ribbon, you should be able to look at your list of Macros with the Macro button near the far left. Under there is a button labeled 'Options...' and it allows you to add a shortcut key combination. It's not ALT but it's CONTROL + SHIFT + [letter]. For example, I use CTRL+SHIFT+A to run my address lookup. I do that for some, and for others I make custom buttons on the Quick Access Toolbar.