I'm getting contradictory information...
An immigration consultant is advising that I must spend 4 to 6 weeks outside of Thailand to go through the application process for a so-called Non B visa.
However, a basic Google search takes one to many posts in which it appears to be quite straight forward to convert a Tourist Visa (with at least 15 days remaining) to a Non B, if you go to the main office in Chang Wattana.
Do any of you know the facts, please?