1.) Generally speaking, it is much more "easy and straightforward" to apply for a DTV at a Thai Embassy/Consulate nearby Thailand:

Vietnam, Cambodia, Indonesia, Philippines, Laos, perhaps Malaysia, etc.

2.) Even at Thai Embassies/Consulates in some OECD Member Countries, the overall process could also be described as "easier and more straightforward", such as:

Australia, UK, USA, etc.

3.) Nevertheless, curious about field reports/experiences of applying for a DTV at the Thai Embassy in Tokyo

4.) From new information on the Website of the Thai Embassy in Tokyo, it seems that non-residents of Japan PERHAPS may be able to apply for a DTV E–Visa at Tokyo, as the stated evidence for "non-residents of Japan" is:

Entry Stamp into Japan showing the Passport Book #,

e.g. older versions of USA Passport Books do not have the Passport # on every page of (older) USA Passport Books

5.) Also, even though all Thai Embassies and Consulates accept and issue E–Visas via the Thai eVisa website, the Thai Embassy in Tokyo has a "Preliminary Consultation" specific for DTV E–Visa applications BEFORE submitting a DTV E–Visa application on the Thai eVisa Website

Approved in Tokyo, Japan 😀

Finally got the approval today, thank you to everyone for the advice and tips along the way. Here is how my process went:

February 17th: Applied under the remote work category.

February 21st: Requested additional documents: Company Registration Certificate and Recommendation Letter issued by company.

March 3rd: Requested to attend interview at Thai Embassy in Tokyo on March 6th (wasn't given choice, it just said be there at 2PM on March 6th). Fortunately I was available then.

March 6th: Interview day. It was quite rigorous and intense. Was interviewed by 3 women at once; one Japanese and two Thai. They mainly wanted to know about my employment. I work in recruitment in Japan and have been doing for 20+ years. I had to explain that I can work fully remotely and that all of my clients / business takes place in Japan. I had to show proof of 2 of my clients, proof that I can do the job remotely, they wanted to see my business card, look at my LinkedIn profile and payslips.

They they touched on other topics; they wanted to know how I know my guarantor, why I cannot speak Japanese completely fluently, where my ex-wife lives, where my adult son lives, why I like Thailand and can I speak any Thai.

I always knew that applying in Japan might be more strict than other countries, because, well, Japan is just like that.

At the end of the interview, I asked them if I will qualify since I checked all of the boxes and they said maybe. They said perhaps they might offer me another type of visa. I told them that I am not interested in any other type of visa.

The three woman were all very pleasant.

March 10th: Approved 👍