You mean you plan to submit both your interest account and the one you use regularly, right? I guess it’s fine as long as both accounts are in your sole ownership and you show proof that you can withdraw from your interest account anytime you want, without any restriction.
As far as I understand, the 500,000 THB bank statement is the proof Thai officials require to believe that you can support yourself well while enjoying your stay in Thailand.
So it would be best if you’d include a detailed explanation on the purpose of keeping 500,000 THB in an interest account and separate your regular transactions in another account.