Chang dao ling

Yes, his biography is awesome

https://www.google.com/url?sa=t&source=web&rct=j&opi=89978449&url=https://www.researchgate.net/profile/Phra-Nicholas-Thanissaro/publication/329758401_Dhammakaya_or_Middle_Way_Methods_of_Meditation/links/5c193594299bf12be388d1c8/Dhammakaya-or-Middle-Way-Methods-of-Meditation.pdf&ved=2ahUKEwjOiPbKsviLAxW63jgGHWHjGbkQFnoFCIgBEAE&sqi=2&usg=AOvVaw1_F-AoykjCOI68gPu-IuB2

It's very easy practice. You just gentle concentrate on 2 finger width above navel. You can also visualise a bright ball or just concentrate it's up to you. I observed two benefits first my patience is very much improved. My second is i experience deep tranquility while practicing this meditation. Note: you can practice this meditation with or without visualization i practiced without visualization

https://en.dhammakaya.net/ Check this website you will get all information about this meditation technique. I don't know if this technique is suitable for you. But you can try. For me this is the best meditation technique i experience deep nothingness while practicing this meditation

He taught neigong not qigong. Why your not interested in his system? Or your not interested in his teaching style?

Authenticneigong.com Rudi taught neigong check this website. Zhou is Rudi's teacher

What is sanxian gong?

Check this website https://www.sanctuaryoftao.org/store

I think authentic neigong and lotusneigong are best for you bro. Forgot about Wang liping.