You can do that. The seasoning of the 500K depends where you apply, some same day transfer is fine others require 3-6 months of seasoning. Wise is accepted by some embassies as is Revolut. Where are you applying?
Anonymous participant 821 if you not got supporting docs and the financials i get why some may pay that. Having the financials for the DTV and paying 2k does not make sense to me.
A personal bank account must be used to evidence the 500k THB, You may be asked to submit a personal bank account or your application rejected if you submit a business account,