If your Embassy of France in Bangkok provides a letter to Thai Immigration verifying your Annual income, it's likely to be accepted by the Thai Immigration office.
Suggest you also have with you the proof of your annual income, if ASKED for it by the Thai Immigration Officer.
You may have to show PROOF of your DTV Visa to airline staff on check-in for your flight ✈️ to Thailand...even to the connecting airline staff. Or to the land border crossing entry Thai Immigration Officer.
Upon arrival into Thailand, show the DTV visa to the Thai Immigration Officer and look at the STAMP placed in your passport to be sure you are STAMPED in for 180 days.
Anonymous participant 325 And this forum is the best to gather information about extending the DTV Visa in country or by departing Thailand and reentering to get a NEW 180 day STAMP.
Take both current and new passport to Thai Immigration office and they will transfer the One year extension of stay as Married to Thai stamp into your new passport.
Re the Re-entry permit... CARRY BOTH OLD and NEW passports with you. That re-entry permit stamp is not 🚫 transfered into the new passport.
Upon arrival into Thailand... show both passports to Thai Immigration Officer and point out the reentry permit.