I moved registration to Chonburi. That was smooth. But three visits needed
1. Application: Green book, cert. of residency, passport, visa; pay B. 25
2. inspection, bikes are allowed to jump the queue for gate 4, I believe the frame ID number was most important
3. exchange Bangkok plate for Chonburi plate
They also issued a new tax receipt, the old one that fell off with the original plate was not required
80 km to Chonburi DLT from Pattaya, more comfortable in a day compared to Bangkok. If I ever buy bike in another province again, the first thing I'll do will be to move registration here.