AFAIK, you can't. It even surprises me that you got the results above.
The Escape key is too important, both to interrupt a partially typed
command if you change your mind, and as the first byte in many
multibyte keycodes to and from the terminal _and_ the GUI (see all the
sequences starting with ^[ (colored blue if you haven't set a
colorscheme) in the output of ":help termcap"), it should be left well
enough alone.
If you want to map something near top left of your keyboard, use
either <S-F1> (which should be safe unless you already mapped it to
something else), or whatever your keyboard sends when you hit the key
just left of the digit-1 key (on my keyboard it is an "exponent 2"
i.e. ², a keystroke not used by Vim). Or if you don't require that it
be near top left, you can of course map anything not already in use —
maybe <F12> at the opposite end of the top row.
Best regards,
Tony.