I think there is nothing new to say.
If you like the Longmen program by Wang Liping, you should enroll in Brine's courses. Learn, interact on the platform, and save money to travel to the annual retreat. These retreats are not open to everyone; you should have experience, some proficiency, and the ability to sit for an extended period.
BTW, in his last book, he teaches the first step in Sanxian Gong.
If you want to practice Neigong, you can stay with Rudi and travel when he organizes a seminar. You might also have the opportunity to train and be attuned by Master Zhou.