Short: Is there any way to display, say, and Amiga-key sign using the MA_Key attribute for menu items?

What I want is not a single key+amigakey. It is rather an arbitrary key combination (like "Ctrl+Amiga+N") containing icons for the Amiga keys rather than, say, the word 'Amiga'.

I have found this to be impossible, but would like to prove myself to be wrong.