Hong Kong doesn't stamp passports so I might be going there. Of course Thai immigration can see I'm coming from HK upon entry but there would be a gap in the trips in my passport so nothing that shows I didn't visit my home country (which by the way has never stamped me in or out) somewhere along the way. So no way for them to check afterwards I wasn't in my home country during the application.
To summarize: I'll leave Thailand, travel to HK, apply for a METV via a non-commercial non-public VPN and IP address in my home country, and return to Thailand upon receiving the visa.