Visited Th since some 30+ years by now and probably have visited at least that nr of temples too-but never ever, nor by reading the famous /en/ newspaper BKK-Post (or before the Nation) or some other sources have I ever read about such groups. Neither from a in my country quite well-known and gay since his early years writer/author living in TH=Chiang Mai since some also 30 yrs. Whereas he has published about every conceivable sexual orientation there may exist.
This does not mean such groups do not exist at all-but if they are will be hard to find and indeed in these modern times that fb will be the best source.
Also: do you know the blogs from christianpfc.blogspot/ he has also visited Taiwan a yr or 2 bfre covid hit and is now in Khmerland=Cambodia. he is also quite interested in anything deviating-what some may call ''abnormal'' for lack of words.