Read the requirements on the website of the Embassy you want to use, or search the group for that specific Embassy, there are loads of answers to that allready.
You can not use DTV to get a Thai bankaccount, for that you need a genuine long term visa, not tourist visa as DTV.
They also identify you by facerecognition and fingerprints, so your whole immigrationhistory will be visibel for the Immigration officer, no matter which passport you use.