How do I map fn to the hyper key?

I want to map the fn key to press all other modifiers (i.e., be the hyper key). How do I do this?

What would you use this for? With BTT you can record standard shortcuts with just FN + one normal key and make them do whatever you want

Compatibility with other software, e.g., Hammerspoon. Some apps also let you define hotkeys in themselves.

I would in general not recommend to do this, because the FN key has various system behavior attached - but this might somewhat work. It needs to be a key sequence, not a shortcut:

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