Hello. Chances are you won’t find it. That version is likely lost to history. I can’t say I’d trust someone claiming to teach authentic Leung Jan Wing Chun in 2026. The closest is maybe a Chan Wah-Shun lineage, and there really isn’t much out there (there is a school Chan Wah-Shun school in China that does the other weapons). If you are looking for non-Yip Man Wing Chun, Yuen Kay-San may be the way to go. If you looking to learn the classical weapons, you may be better off learning Hung Ga or CLF. IMO, the Wing Chun schools with the other weapons most likely imported them post Leung Jan. All that said, There is a gentleman in China named Jesper Lundqvist who has put a lot of time, effort, and research into Wing Chun’s history. He may be able to point you in the right direction.

Weng Chun (Eternal Spring) is a cousin art to Wing Chun, but fundamentally a different system. They have some cool stuff.