Sadly
@Dennis ********
there is no "transitioning" to the DTV in thailand 😮
You can't get that visa inside the country
You can only get that visa from a Royal Thai Embassy or a Royal Thai Consulate General in another country 😉
If you're in thailand you have plenty of choices to pick of the thai consulates in nearby countries. Phnom Penh, Jakarta, Taipei, HCMC, Hanoi, Vientiane, Savannakhet, Yangon, etc