I figured this would help your decision with regards to Bangkok. Also The Bangkok Post is an English speaking newspaper that has good info, don't know if a subscription is required.
thepattayanews.com
Covid-19 vaccine guidelines for travellers to Thailand-How many doses are needed to be "fully vaccinated"? What is accepted? - The Pattaya News
The following is a chart from the Thai Government PR office which shows how many doses one needs to be considered "fully vaccinated" and what is accepted, a popular question here at TPN media. The chart is credited to the Thai Government.
thepattayanews.com
