What should I do after being denied a non-O Thai children's yearly extension and suggested to re-enter Thailand on a visa exemption?

Just got denied non "O" thai children yearly extension because I switched from 400k method to monthly 40k transfers but my nationality (CAN) required an affidavit from embassy and even if i quickly transfered 400k now, would not work because money has to be seasoned one month. Now, with too litle time left, I was suggested by immigration in Chaengwattana to get out of Thailand and come right back in again without a visa (30 day stamp exempt). In that 30 days, once i transfer back 400k in bank (no seasoning), go back at immigration to change it to a 90 day non "O" (tm.87). And after the 90 days are up, back to yearly extension again usine 400k method. Anyone ever did this?