Which Thai banks allow opening multi currency accounts through their App?

Hi all I have a question for a visa extension for 1 year based on guardianship of child at school here is it possible to have the 500k held in a multi currency account like transferwise? Does it have to all be in 1 account? I am trying to avoid the large transfer fees bringing it in to Thailand and back again. Can the total sum be held across more than 1 account? Any help appreciated