People would understand if I put feet on the Star of David?
Put the most common Darwin hate symbol over the Star of David or just put feet on the Jewish symbol as you mentioned, either way people would know what you are saying and admire you greatly I’m sure.
If you think current anti-Christian hate symbols are not sufficiently insulting for anti-Jewish purposes, then surely the people that design, manufacture, and purchase the symbols can come up with a new design.