I book one way on an Asia carrier and no problem. One week prior to entry stamp expires, I go to immigration at local mall and complete form TM6 or 7 and pay for extension for 30 days to train in Muay Thai or what ever your reason is.. then buy your exit ticket after extension granted.
Every one has entered Thailand at different times (recent/distant) with different experiences, so trying to give advise humbly is okay for me. At least give them directions of where to look is acceptable to me. Lord knows I need it from time to time.
I presented years ago and received a short term (maybe 1 year or 2) year DL with simple test. The past year I presented on a one year visa and I was required to take 6 hour video and approximately 50 question test and driver’s course test for MC and one for car. Multiple days of testing.