the extension under the covid ministry instruction can not be converted to another vise inside the country. I have checked many times with Thailand Elite, Siam Legal, Thai immigration. You have to leave and come back.
You can't If you are on the Covid extension. You have to leave and clear what they call your overstay and they apply the visa on arrival back in Thailand.
every time you do an extension you give evidence of your address anyway. The TM30 is only evidence you complied with the rules after you arrived in the country.
