There used to be a clicker called Klickety-Klik that attached to the t or bottom limb and a string attached to the bow string. It worked and sounded just like those old hand held crickets. You know. Push and let up and it went klick-klick.
Maybe worth a look. I used one back in the 70's.
Martin/Rytera Silver Star Shooter
UBP Life Member
PSAA Life Member
Worldwide Scuba Diver