Pretty sure they wont recognise your carnet, the Thai system has always been 'unique' I believe.
Plenty of nice countries to choose from for a trip out though if you need to stay longer. Be aware though that they are tightening up on 'visa runs' and there are rumours of if being difficult to get back in (this is generally aimed at people staying here to work illegally though and doing multiple runs rather than genuine tourists).
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