There are forms to only use monthly income to add up 6 months of the saving requirements - im in the same boat as you i converted to ed visa in a week being here - i would recommend getting the ed visa thai courses thai boxing cooking or self defense. The schools will do the paper work for you in all total can cost around 1300USD including in country conversion but you need 21 days on your visa at least - or you can have the school start paper work goto Vietnam and the packet sent to you there and you apply at thai embassy there saving you
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baht for conversion. The student visa is 1 year but you have to extend every 3 months ( 1900 baht ) and 90 day report
Example i am 41 I will do 3 years of ed visa then convert to DTV after that expires I will apply retirement