Anyone know if the 400k in the bank for 3 months prior can be changed to the 40k a month requirement instead of ??

No problem, you can chose which option you want to use.

Both methods are allowed.

Thanks.

Whats the easiest way or most accepted for proof of the 40 K

Thanks.

Whats the easiest way or most accepted for proof of the 40 K

That depends on where the income is earned. If earned within Thailand you will need tax documents to show your income and paid your tax.

If the income is from abroad you will need a letter from your embassy confirming your income. The requirements for issuing such a letter are set by the embassy.