Can I apply for an A/O non-immigrant retirement visa in Thailand after entering on a 45-day stamp?

An Australian considering a trip to Thailand on a 45-day stamp in January seeks advice on whether to apply for a Non-O (A/O) retirement visa while in Thailand or before arriving. Responses highlight that applying for the Non-O visa after entering Thailand is possible, as it typically requires evidence of funds in a Thai bank account, while the OA visa should be applied for in the home country. It is noted that the OA visa can only be pursued from Australia, requiring 800,000 Thai baht, whereas the Non-O visa options may have different requirements depending on entry and residence status.