It appears-your experience has been very different from mine. I have had multiple extensions and I go in and apply about two days before the end of my Current extension. They keep my passport for two weeks here in Chiang Mai and then I go pick it up. The stamp Put in my passport is the day I applied for the extension, not when I picked it up.
I found my 20 years of whitewater kayaking experience had some positive carryover into bike riding- feeling comfortable leaning to the side and being in the moment. Mindfulness, continually monitoring your environment is necessary.
If you want to get an IDP to drive a bike here, my experience, I went to AAA in America and was told I would need a USA motorcycle license. I opted to get an automobile IDP, but when I showed it at a police traffic stop in Chiang Mai I was busted and had to pay the fine.