I recommend taking out a loan from home country and then paying it off little by little and putting the 800,000 baht into a bank account here in Thailand when you arrive here.
This new DTAC system is part of a wider transformation of the country’s migration policy, which is already underway with the deployment of electronic visas (e-Visa) and tighter monitoring of entry/exit to the country.
deposit seasoned 800k when aplication and half year deposit min 400k. If married to thai it's half. After first year it's easy to change to monthly income if your embassy give affidavit or married thai then hes income need meet requirements but for Farang lady it's easy..