What are the steps to switch from a Non ED visa to a Non B visa in Thailand, and what are the implications of overstaying?

I went to Chaeng Wattana Immigration this morning to ask about switching to Non B from Non ED (expired student) as I just got recruited by a Thai company, and I COULDN'T do it.

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The officer told me ONLY "Teacher" applicants are considered.

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Plus, amnesty period will be ended on 26th Sept 2020. Unless you go out of Thailand before the nominated date, you must:

(1) Go to your country embassy to ask for the extension form.

(2) Bring this (1) form to local immigration to get the stamp (+30 days -> to 26th October 2020).

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All foreigners who must leave but still stay inside the country after 26th Sept 2020 WITHOUT permission (2) will be counted and fined 500 thb/day for overstaying.

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Ps: attached pics are the newest appendix to Immigration laws, requested by Ministry of Education, applied to teacher applicants who want to switch/gain Non B visa in-country.