[racket] Keyboard input in DrRacket

Hello,

in italian keyboards the character ~ is missing, and, on windows, the
usual way of entering it (Alt-126) does not work in DrRacket.

Could \tilde be added to the list of keyboard macros recognized by M-\ ?

Alternatively, is there a way to enter ~ in DrRacket that I have
missed? (other than switching keyboard driver, or copying&pasting from
a different program, that is)

Thanks!
P.