Hi, I've checked with my friends - there are a couple of
suggestions,
i heard that Da Zhong maybe got, otherwise,
you can visit Palyul Nyingma Centre, heard their lama teaches
Tibetan, but it's not a systematic course.
or... you can send an email and ask ABC (Amitabha Buddhist Centre),
it's a large Vajrayana centre and they might know.
Good luck 