Adding a "quick-help" menu

[Philip Kaludercic]

There is a fork of mg (MicroEmacs)[0] that binds C-h q to a command that
pops up a buffer with these contents:

--8<---------------cut here---------------start------------->8---
FILE             BUFFER          WINDOW           MARK/KILL       MISC
C-x C-c  exit    C-x C-k close   C-0   only other C-space  mark   C-_ undo
C-x C-f  find    C-x k   other   C-1   only this  C-w      wipe   C-s search
C-x C-s  save    C-x C-b list    C-2   split two  C-k      close  C-r r-search
C-x s    all     C-x b   switch  C-x ^ enlarge    C-y      yank   M-% replace
C-x i    insert  C-x g   goto ln C-x o other win  C-x C-x  swap   M-q reformat
______________________________________________________________________________
C-h q  toggle quick help  |  C-h t  show tutorial  |  C-h b  show key bindings
--8<---------------cut here---------------end--------------->8---

I notice that in GNU Emacs C-h q is bound to `help-quit', which does
nothing if you are not in the help command loop.  Would having a
"quick-help" menu along these lines for common operations make sense for
GNU Emacs as well?

[0] https://github.com/troglobit/mg