The easiest fix would be to search/replace, but I'd like to take the opportunity to also introduce errcheck callables like

from functools import partial

def errcheck(result, func, args, error_val):
    if result == error_val:
        raise WinError(get_last_error())
    return result

SetConsoleMode.errcheck = partial(errcheck, error_val=False)
WaitForSingleObject.errcheck = partial(errcheck, error_val=WAIT_FAILED)

This will make the code much cleaner and "automatically check everywhere". E.g., currently none of the SetConsoleMode or GetConsoleMode calls is checked - and thus a search/replace would not fix them.

This makes the diff slightly larger but IMHO still qualifies for backport, since 3.13 is affected, too.
And the missing checks are bugs IMHO, so we'd have to touch those code parts, anyway, and will most probably end up with not really less diff lines ...

I will do a PR if the repl maintainer agree with the above (@ambv, @lysnikolaou, @pablogsal).

My preference is still that we ought to be actively migrating from ctypes to a proper native module for these. Performance and reliability will thank us.

Beyond that, I don't have a real preference, though I'd vote for the simpler fix just because it's not worth investing heavily in code that I think should be completely rewritten 😉