If you get s covid extension, you won't be able to leave and come back within a certain, unknown, amount of time.
But leaving for a week and coming back makes you look like a normal tourist and those 120 days in total won't matter to immigration if and when you come back later.
In the big cities and the southern parts of the country there are tons of halal restaurants run by Muslims. So if you're in Bangkok or down southwest, you'll be fine.
no it doesn't. They are changing the rule so you don't have to apply for a new Thai pass if you have to change your flight, within 7 days of the original date.