When it happened to me, not even 2 years ago, I was told the emergency passport is valid to enter maximum 7 countries, on a pre determined itinerary, on your route home. So the emergency document lists the countries/stops, in chronological order by the sounds of things. But I never took one, as I had found my passport, 18 days later. If I were you, I would call the embassy again, speak to a different person. Ask about this 7 countries/stops rule. I think its a worldwide policy. Tell them you have a short itinerary, all pre-booked and paid, and you're going to meet family, in Malaysia, before returning to Thailand and flying out of bangkok and you'll never afford to come again, and just try and charm the emergency passport from them. Otherwise, how long overstay will you have ? 3-4 weeks ? And you would have been just extending your stay/visa locally on 18 March ? They 'should' transfer visa to your new passport, and extend that, but any overstay will come off the extension period. I'm not sure what happens after the 30 extension has lapsed also ? Certainly if you apply for any visa, they give you a 7 day exit stamp, which us not a good look. But certain immigration will let you back in. Firstly, if not already, report passport as lost/stolen with tourist police, and capture evidence of this, photo of/and crime report paper copy. Also capture any emails with the embassy, as further proof of lost passport. Just be wary that taking the emergency document may impact your passport application, ie cancel it.
From phuket, just take a seat with visa run company at 2500, whereever they go on the day, either Ranong to Myanmar, or head south to a border checkpoint with Malaysia. Out/back in in 5 minutes, the driver guides you through, any problems they step in, get home some day. He can fly out/back in, also same-day, or stay any amount of nights, and do it on his own steam. He has the visa so should be no problem with re-entry.
I never said I didn't like what I was reading. Infact, by saying "I hadn't heard" is kind of an invitation for you to elaborate. As for your peculiar use of capitals, I thought there might be an interesting reason or story behind that, but you're clearly not in the mood, and neither am I now. Thank you