@Naj ************
This is correct. I didn’t have any motorcycle license at home, had my national car license but no IDP and I needed to do the whole process for both from scratch. I did get a residence certificate without a 90 day report when I applied in Buriram.
I took two theoretical test both 50 questions and maximum five incorrect answers. Practical test in the backyard for both car and mc, watched a mandatory movie and did some simple test regarding sight and reaction. Paid around 700thb for both. Without long stay visa you just get it renewed for two and two years.