visualizing input with an input line

[Sven Guckes]

is there a way to show the input of keystrokes on a separate line?

background: i want to show tmux/tmate (and other tools).
and the usual question is: "what did you type there?"

i could run "screenkey", too, but then i must capture that
together on X and rearrange the therminal to make it visible.

i would rather show the contents of the terminal itself than
to capture the whole desktop with terminal and screenkey.

and rather than changing every program running inside
to show its input, i'd like to turn on an extra line
above tmux's status line to show the input
that ran through tmux into the windows' process.

then i could catch that with asciinema ("text only movie");
then people can see what i do, and i can
finally see where i mistyped all along. ;-)

example:

vim: finally see where i mistyped all along. ;-)
input: [0] ..all along. :-)[ESC]:w[ENTER]
status: [0] 0:EDIT 1:RSS 2:MAIL 3:neomutt- 4:zsh* 9:IRC

what do you think of the idea?
would it be possible in tmux?

Sven