@Lily *******
Well, now after you clarified that you are a Thia female asking for your farang husband, then I can only repeat what I wrote before:
if he does a border run before the visa validity expires, he will get stamped in for another 90-days stay permit. This will give him enough time to season 400.000.- THB in a Thai bank account in his sole name.
and he could also visit Immigration together with you and a freshly printed Kor Ror 22 marriage registry document from an amphoe, and ask for the 60-days extension based on “visit family”