Not sure where you are located, I went an agent in Pattaya they took me to dmv I got my Thai driver license with add on motorcycle license quick easy and cheap! Driving and motorcycle very dangerous in Thailand! Isaan maybe a little bit, anywhere else, not recommended! Taxis, vans and bus are cheap and fast! Also train.
I’m from USA VT. Why didn’t you go to Thailand get your 30 day entry then extend? Agents and US EMBASSY BANKOK. Is a much easier bath. I’ve done it myself several times.