look. I use Wise to transfer money from UK to Thailand on a monthly basis. Have done for 5 years. Wise tells me exactly how many baht will be sent to my Thai bank. Exactly the same amount of baht appears in any three of my Thai banks in around 23 hours. NO CHARGES HAVE EVER BEEN TAKEN FROM THIS AMOUNT BY MY THAI BANKS. You can listen to people on here who give you information or you can ignore them. Up to you. However, if you use an overseas card to withdraw from a Thai atm then you will be charged 220 baht on whatever amount you withdraw.
I had changed my address since my last on line 90 day report. I had also registered the bew one at local immigration. I will remember that tip though it will save a lot of time.
Maybe I am not quite understanding your situation but why didn't you just go to local immigration and get a 30 day extension in sakhon Nakhon? I've not heard of anyone being told they must re enter Thailand via Bangkok.