You cannot change the type of visa, or apply for an extension based on being married to a Thai from the initial 90 days of Non-ED. However, if you are already on an extension based on studying, means you already applied for one or more extensions after the initial 90 days, you may be able to apply for a 1-year extension based on being married to a Thai by meeting all requirements.
Q. Can I really not change the visa type at Chonburi immigration?
-> You need to check with them. It could be possible to apply for an extension based on marriage to a Thai IF you meet ALL requirements for that, including funds seasoning.
Check the list from Penang. Basically, same as the KL version. If you have a question, you need to contact Penang.
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