Understood. For a regular bank account, I have been able to do reKyc online several times in the past - using Aadhar authentication and basic information.
Same might apply to NRE account. maybe - not sure.
You might also consider checking Indian banks operating in Thailand catering to NRIs.
I use crypto to get US dollars in cash and then I exchange it whenever I need. I also use a crypto debit card and my personal credit card from my home country which has zero forex charges. Cash is king.
Only inconvenience is not able to pay via QR code at vending machines.