1: They would, so it’s not recommended. And it’s never a good idea to be listed with a overstay, no matter if it’s only for one day
And most likely the airline will not let you on the plane if you don’t have a valid VISA if you gonna stay longer then 30 days, or a ticket out of Thailand within 30 days
certificate of residence is necessary, because there is your address stated
Normally it’s no appointment, you just come and make the tests and handover the documents, but now during covid you might first book a time and then come back, if so you can absolutely start to book a time and then fix all your documents
TM 30 is initially required for your report of residence when you stay in private home and not in a hotel
So every time you will visit immigration and they see that you haven’t file the the TM 30, there is always a risk that you get fined, not necessarily, but why take the risk
You have one year to renew your license after it expired and yes you need to go to DLT to do a reaction and a eye test. And the documents you need to bring with you is