Hollywood "Chirp" with 22lr suppressor

[mr fixit]

Long term planning....
with a 22lr pistol, shooting sub-sonic ammo from about a 4" barrel, is there a way to make each round sound like the classic hollywood silencer chirp like this: https://youtu.be/iBv5X9000Ig

I'm thinking of basically trying to make a whistle chamber in the end cap?

Ideas appreciated.

[Capt. Link.]

I once suggested adding a duck call to a suppressor for audio camouflage.

[alordnapa]

Weren't you concerned that someone might think you are hunting ducks with suppressed .22?