damdao

https://authenticneigong.com You can find threads in General Discussion, I think. Very good teaching and methods, highly recommendable if you want to know how to build the dantian and do faqi.

Even today there are lineages of external alchemy, medical branch https://classicalchinesemedicine.org/conversations-with-the-salt-doctor/

That's true, and the Xingyi from that period was transformed and merged with elements of Longmen boxing arts. Referring to Wudang as a unified entity is misleading. Today, we see the Sanfeng daolu, often described as 'Yang-style Taiji with low stances,' but there are also Longmen, Songxi, and Chungyan traditions, along with remnants of Dan Pai, Ziran, and others. The latter two had ceased to exist as independent lineages by the early 20th century. Therefore, it's essential to trace the so-called Taiji of Longmen and Songxi back to their likely sources—there's no need to attribute these arts (Longmen and Songxi pai) to any government scheme or institutional design.

Wudang daolus contain internal work comparable to that of Yuxianpai—at least in the forms that existed prior to the Chinese Civil War. Whether this remains true today is uncertain, though not entirely unlikely. It’s also possible that Wudang practitioners adopted external martial forms and later infused them with internal practices. Some teachers have suggested that internal styles existed even before Taijiquan, as Forestgreen mentioned—such as Xiantian Quan and other systems now lost to time.

I don´t know Oscar personally but he is very approachable so you can write to him and ask him many things about his system. He interviewed Matyas Dally, so you can find the video in his site or channel (I don´t remember where).

Besides the links above you can contact Robert Coons https://www.facebook.com/daoistmeditation and Oscar Idelji https://thenuwa.substack.com/p/the-essential-teachings-from-the.