Not on LSD, I’ve done some emotional processing with others on MDMA but I don’t know if I’d describe it as “targeted work to change beliefs”, it was more stuff like “talk about my relationship with my family more openly than I’m usually able to.”
I was introduced to belief reporting, but I didn’t do very much of it and wasn’t on drugs at the time.
It was historically a direct relationship, but afaik hasn’t been very close in years.
Edit: Also, if the “Vassarites” are the type of group with “official stances”, this is the first I’ve heard of it.