What is the process for obtaining a Non-B visa at the Thai consulate in Tokyo?

Right, I once got a visa in Tokyo. This was several years ago, so take this with a large pinch of salt.

Basically, like most things in Japan, it's very orderly. You have to register first to make an appointment. You then have to turn up on time for that appointment, submit the usual range of documents (I don't remember submitting anything out of the ordinary) and pick up either 1 or 2 days later. Relatively straightforward, however, it's a very busy embassy because of the number of Japanese applying for visas. I was not living in Japan at the time, so it is possible if you don't live there.

Anyway, email them first (as you suggested elsewhere on the thread) - you would have to make an appointment anyway (if it's like it used to be). They didn't allow you in without an appointment when I did it.

From Time spent in Japan, a certificate of Alien registration, put simply, was kind of having a pink Thai ID card. Anybody staying longer than 90 days, except military personnel and some others, had to register.

The cards were municipalities issued. It changed around 2012 to a National issued and registered card.

There isn't much you can do without a card. Even buying a mobile phone etc you need one.

I googled around and was unable to find any up to date information about ANY visas from the thai consulates in Japan.

I'd say before you wing your way there definitely send them an email and see if you can get some concrete answers from them.

You did read this right?

For non-Japanese applicant, a copy of residence card or certificate of alien registration which is valid at least 3 months or more.

I don't know what a copy of the residence card or certificate of alien registration is (and it might be as little as your arrival card OR it might mean you need to legally live there to apply for a thai visa at that consulate)

Okay the thai consulate in Tokyo issues Non-B visas for four different reasons. Working, Business, Teaching & Performing, Entertaining Arts

Here's the link to them