Crazy.. I will apply straight citizenship 2569 and hope can forget these visa schemes, wp and company ownership things.. my friends has been thai passport holders decades and lucky I did listen them😅
You can ofcourse sign your own company papers without WP. Yes you need work permit even voluntary free work here. It's easy process if local people can't do work/skill what you offer.. You just need non o spouse or b visa if want apply WP.