How to change the app switching keyboard shortcut from the standard Cmd + Tab key to Cmd + Eject key combo? I would like to change the Cmd + Tab hotkey to Cmd + Eject.

I use a Mac Aluminium keyboard with the eject key, which is only present on external keyboards.

I would like to try this key combination, or other possibly, to avoid the excessive amount of Cmd + Tabs I do every day; and even maybe prevent a future RSI.
You can use a keyboard customiser app like Karabiner to tweak the default key associations.

Karabiner is a free software.