Yes, 30 day visa exemption for French. Nothing to apply or present before checkin / arrival. If fully vaccinated, no need for test. If not: COVID test needed. And yes, return (or onward) ticket out of Thailand within those 30 days is needed as well (though might not always be asked for / enforced) at either the checkin counter or at Thai immigration.
An extension is not a visa. So choose the actual visa you entered the country with (or in rare cases changed to in country). If you entered without a visa / on visa exemption, choose that.
No. But do your math to find out if itβs worth the much steeper visa fee (and stricter application requirements) - or if single entry visa back to back are the cheaper and easier option.
IF your husband will have (permanent / long term) residency in Germany, he will be able to apply for a Thailand TR tourist visa through the eVisa system with the Thai consulates in Germany. For this to be applicable he would need to be "granted a residence visa [so any national visa, not a Schengen tourist visa] to stay [in Germany] for more than six months". Check the following websites section: "Am I eligible to apply online?"
True, yet ironic. Cause having a work permit / working in Thailand likely correlates to having a smaller (and potentially less secure) income than someone who works remotely for some western countries company. But banks in all countries are kind of national-focused in this respect, not only in Thailand.
Probably going to be difficult. It might work if someone acts as a guarantor for you (spouse?). But probably easier to put it in the spouses name in the first place. Or best of all solutions: Pay cash. Always best to pay for things to play around with (like motorcycles) with cash from savings. If you don't have any, maybe you could get a credit from your home country and then use that to buy the motorcycle. Just a few thoughts. Never tried to get financing in Thailand myself thus far.
Or if you already stay in Chumphon, make your current hotel or landlord does the TM.30 reporting (they can do it online or on a paper form in person) and share the proof of successful reporting with you. No need to check in to another place then. π