According to the Thai Embassy in Tokyo, once your application is rejected, it is difficult to get a DTV permit in another country. This is because the E-VISA application comes with a question: "Have you applied before?"
You should avoid applying for DTV in Tokyo. If your application in Tokyo is not rejected, you can apply again in another country. If you ask the Tokyo embassy why this is the case, they will answer that it is the kindness of the embassy.