And yes. Anyone going theough that border will have to use one of the agents ( imigration will direct you) or have All the requirements whatever visa you have. As im sure you found out already.
Theres a very good FB group that specialise in Thai Citizenship. Almost no trolls.
If youve been married to a Tai for 3 years, held the same visa and extension there of for 3 years, had the same wp with same employer and pay tax for 3 years youthen qualify to apply for Citizenship and skip PR.