ETA has been pushed back. The digital TM7 arrival form is different. The TM6 was what was supposed to come back on May 1st, but no official details are out about it yet.
Worse case you will fill it out on your phone while waiting in line at immigration. But if you are this worried about filling out a form you might want yo rethink Thailand. They love to make statements that go nowhere and change the rules constantly.
Just relax and roll with the changes or you will stress yourself out of any enjoyment.
They aren't a business though. They work for the airport which is semi government owned and run. When has anything remotely government been worried about being efficient or making money.
Find a visa agent in the area you are visiting they will be able to explain everything. Maybe ask the same questions of several different agents as I have seen them give slightly different answers depending on what generates the most money for them.
because if they aren't where they are supposed to be, ie taking a random off to their destination, and they get a call they could be fired. The boss tells them where to go. Why risk their job when they can get paid to ignore you?
Just highlight income coming into your account on your bank statements. It is money coming into your account whether you call it a paycheck or not is meaningless.
Don't try and over-think it or get fancy. They don't care that you are using one account to get around taxes. All they want to see is money coming in. Just show them that anything extra will only make them dig deeper and cause problems.