>and the kids are non-immigrant F
I'm surprised. The Non-Immigrant F is to perform official duties. Are you sure they aren't on an ED visa or a Non-O visa?
>We were thinking of switching to student visas for the kids (5 & 7 years old) and guardian visas for us. Three questions: is this the most sensible option?
Yes, I think so, at least legally. Logistically might be difficult though.
>What documents do we need?
Ask your local immigration office. What office are you going to use? You may be able to do in country conversion.
>am loathe to travel overseas at the moment for fear of self isolation
*IF* you have to leave (highly unlikely), it'll probably be to Laos, which I can't imagine being on any type of quarantine anytime soon.
My opinion:
1. Figure out the exact date when you're planning on leaving Thailand. I'm assuming you want your children to stay in school until the end of the term, which is early July.
2. If you're from a visa exempt country (see
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9.pdf), simply bounce in and out of Thailand once your husband separates from his employer. On each entry you'd get 30 days, extendable at immigration by another 30 days.
3. Assuming your children are on some type of dependent visa, I recommend simply letting your children go on overstay. There is no fine or other penalties until they turn 15.