[toastal]

The schwa + 'l' ("le") is the exact sound I'm talking about. As a someone wanting to practice good privacy, having an alias is always nice.

It's pretty obvious now though. Most all 'weird' Thai pronunciations for English come from transliterating English into the RTGS Romanization system (whose sounds don't align with English, like 'p' being ป, the unaspirated version of that sound which English doesn't have) an then translating from the Romanization to the Thai abugida to be pronounced. Speculating, since someone misunderstood stress syllables always put a falling tone on the final syllable and now you have the Thai pronunciation. Pepsi isn't translated as phonemes as เพพซิ, but p-e-p-s-i as ป-เ-ป-ซ-•ี; smash in that falling tone and you get เป๊ปซี่ which honest to Godzilla sounds like bep-SEE instead of PEP-si. Ask someone to read your ID and they'll use this same system to read it instead of trying to think about how English writing works.