What are the options for extending or converting my family's visas in Thailand after being on a Visa Exempt Stamp?

Needing advice on context and concerns below. Our family is on Visa Exempt Stamp (after 3 years outside Thailand for a supposed vacation then the world closed) that ends in May 3. Thinking on possible next steps depending on timeline. Expired Non-B and Non- O visas due to the pandemic. All got new passports.

1. 30 Day Tourist Visa Extension in-country - I believe we can request at IT Laksi in BKK or in Chiang Mai. As for TM30, the latest hotel receipt would possibly do right? Weve been hopping varied places of stays.

1. In-country conversion of Tourist to Non- B (teaching) and Non-O dependent Visas (for wife and children), within the 15-day validity of stamp.

* Would appreciate recent success experiences in BKK or CNX Immigration offices and the list of requirements please, if this is possible. So we can ready them.

* Would it matter too if the Work Contract states employment is effective not until August 2023? Will Visas approval depend on the dates indicated in the employers documentation, for instance the Employment Contract date? We’d like to process the shift to Non-B the soonest possible time.

* Read about Work Permit and Visa cancellations, will this still be necessary? Our Visas were in the old passports and all have expired while we're outside Thailand.

3. Upon 30 day Tourist Extension expiry in June, would need to fly out for application of Non-B and Non-O in a Thai Embassy/Consulate in Vietnam or Laos maybe.

* Would appreciate recent list of requirements and experiences from you guys, in a consulate near Danang or Hoi An, Vietnam as we have a planned holiday in June there.

Appreciate all your help. Cheers!