I think they normally want a "certified" translation. Which means a translation company does the translation and then certifies that it's accurate. And then possibly you need to get something done at the MFA after that, but I'm not sure on that part. You should be involved in the translation process if you want to influence the Thai spelling of your name.
Paying rent or not isn't a factor for TM30. TM30 is required by law if you are staying at a location. The owner must file the TM30 within 24 hours. So your wife would submit a TM30 same as before.
If you haven't been in Thailand recently before doing it then it's risky. There's no rule about how long you can be in Thailand like this but people get warnings after 2 times and some even get denied entry if they've spent too much time in Thailand without the proper visa.
So if you haven't been in Thailand recently before doing it and if you don't plan on returning for at least 6-9 months afterwards, it's probably okay
You will not get the visa without the insurance. Because the visa is valid as of the day it is issued, so you can enter Thailand that day. So your insurance must be valid to get the visa.
When you enter Thailand with a non-OA visa, you are stamped in for 1-year, or until the end of your insurance, whichever is less.
Actually, that's the TM47, 90-day report, not the TM30. TM30 does not have a date to do another one, that's only 90-day report.
If you have a yellow book and certificate of residence, then you would have already done the TM30 since that's something you need to get a residence certificate.
that depends on the things I asked in my post. If the agent did things that are impossible for a normal person to do, then you cannot get the next extension yourself because your file has anomalies, like no history of required funds, or receiving your visa/extension before they would normally be allowed. Red flag and you'll be sent away