American Fan:
Vietnam? I was also thinking the Philippines but I have the impression it's a very religious culture (Catholic?) which might be more challenging. How about Japan?
One can hope for any of these three, maybe even Cambodia.
Public opinions have been changing rapidly in Japan (see survey below, actually ranked #1 in the region!), but the political culture is very conservative and painfully sloooow.
Vietnam and Cambodia seem to be interested in LGBT tourism and such, and public opinion is also quite accepting (see below, #2 and #5 respectively), but they're far more authoritarian and thus hard to predict.
The Philippines is a bit of an enigma in that it's very Catholic but at the same time a very enthusiastic BL market - and although it's not in the survey below, my understanding is that it's fairly accepting of same-sex relationships. Nevertheless, I wouldn't hold my breath.
This survey was published in November 2023 by Pew Research, which is very highly regarded: