Your situation is different. BKK airport have been strict for 7-8 years, even more so lately but they were already denied a lot of people. But you have a good chance of being allowed in by LAND. Bangkok airport is to be avoided. I haven't enter via Bangkok for 8 years.
It's the Thai - Laos Friendship Bridge. I've cross that bridge 20+ times, never heard of Saphan Mitaphap. You are the first ever case of denial entry in that border. You made a post August 31 in Bangkok about the IO questioning you. What is your history after that?
If I'm right about my previous comment, you need to enter via Bangkok with fast track service using Thai Visa Centre agent. It will cost you around 8k baht to enter safely.
Travis never elaborated on which border he was denied entry from. He asked for people with connections at Nong Khai border but this doesn't mean it's where he got denied entry. Also, he didn't mention the writing in Thai in his passport. If there was a note saying to not let him in, no border or airport would have allowed him in without a visa. I'm assuming that he was flag, knew it, but didn't read what was written in his passport before bouncing.