Hey Richard! I haven't heard of too many electric bike companies that ship to Thailand by default but I did recently ask the folks at Ridekick about shipping to the UK and they said they would do it for ~$300 USD. They make a cool electric-assist trailer that works with almost any bike and lets you carry some cargo around.
I also recently heard from Falcon that they have shipped several of their Falcon 350 models to your country. I believe they offer free worldwide shipping which is amazing! They are based in Canada and I've spoken with their founder on several occasions, as well as customers who have received support on the bike. Seems like it could be another good option.
Yes, checkout www.electricbikesthailand.com they got a good range. Bikes in Thailand are taxed an import rate of 60%. !!! So importing or getting a bike "sent" might end in rude fashion at the local customs agent so be careful.