Earlier quoted context omitted.
>EDIT: Of course, I'm not exactly familiar with the visa situation since I don't actually need it. Based on the OP, it seems pretty complicated, but still worth the hassle. I lived in Thailand for several years and 'bootstrapping' your business there as a foreigner without a work permit is breaking the law. You need a work permit to do ANY type of work in Thailand and although working out of sight is unlikely to get…
1. You are allowed to do business meetings on a business/tourist visa. 2. You can do business meetings from a co-work office. Now please tell me how being in a co-work office, working for a company incorporated abroad and not accepting local payments, can get one arrested.
You can't conduct any type business on a tourist visa you will be deported if you are caught. People have been warned that they will be deported for singing on a karaoke in clubs as it's classed as work.
The business visa you are talking about (NON-B) is designed for employees of foreign companies who are conducting business with Thai companies. Not foreign businesses conducting business alone or with each other.
In fact without evidence of this you won't even get your NON-B visa.
http://www.mfa.go.th/main/en/services/123/15388-Non-Immigran...