They can get a non-o visa and then one year extension of stay at immigration.
Requirements for the non-o visa is here. https://www.immigration.go.th/wp-content/uploads/2022/02/8.A-PERSON-WHO-HAVING-RESIDENCY-IN-THAILAND-NON-O.pdf
Embassies and official consulates will issue them but the wording can be a bit vague.