I found the command, Help -> Keyboard Map a while back.

If it had 1 additional TabStop beside the “[Current Keys]” Tabstop it would pretty much have this functionality.
Additional TabStop: [Key]
Which just shows the current assigned key, without any modifier keys, then the list could be sorted by keys…

Currently, when you double-click on any item in the Keyboard Map list it opens that command focused in the Keyboard Properties (config).