You may also require a certificate to confirm you are still married. Samut Prakan ask for it and it’s on their list of docs to be presented. They also request photos in house of all rooms excluding bathrooms
I get a home visit every year when I renew my Non O extension from Samut Prakan IO. I have never been asked to pay a fee. Always polite and offer a drink is all it costs
The only sure way is to check with the initial airline that you can check your luggage all the way through.
I flew Astana to Istanbul for a connecting Gulf flight and no matter how much I begged they still made me clear customs and buy a visa for Turkey. Which was issued and cancelled 35 mins later when I passed back through immigration
Should not be an issue. Just send the old passport off with all the documents and explain why you are getting a new passport and why the documents have the old passport number.