Yes you can. And Koh Samui last time I did (a month ago) didn't ask for Tm30. I just brought passport and a photo. The copies and forms I got all there.
The immigration officer were telling to everyone to return before 29th Jan if they want the 60 days extension, even people with visa that runs out end of February. the suggestion you're giving to people to not go there to "hack" the system is based on what?