Good question. A few answers for you:
– Rinpoche will give the teaching and transmission in Los Angeles in March. See here: https://yeruboncenter.org/event/dzogchen-ngondro-opening-your-inner-space-for-spirituality/
– Rinpoche values the Ngondro practices highly, so if you cannot attend that teaching, expect it to be taught every couple/few years. Other qualified Bön teachers also give this teaching and transmission, so you may find one sooner looking around.
– It never hurts to reach out and request a teaching from Rinpoche (reach out to the Administrator through the form here: https://yeruboncenter.org/contact/). I certainly couldn’t promise anything, but depending on where/when it is held, attendance, etc., it happens.
Hope that helps!