Sorry, but it's not going to happen (at least not any time soon).
See this answer for details: https://windowresizer.userecho.com/en/communities/1/topics/1120-safari-version#comment-641
Safari supports web extensions now so while not effortless, it could be done. I've been waiting for the extension to be available for Safari with my wallet open to make a donation.
Customer support service by UserEcho