You are not rewewing anything, you are doing a 90 day report as required. Just take your passport and TM30 as it may be required. Re-entering Thailand with a DTV you just need your passport and DTV to get a new 180 day stamp and your 90 day report starts again at 1.
To open a bank account you need to get a Non-O retirement Visa, do that for your April arrival and you'll get a 90 day entry stamp to get things set up. You can get a marriage Non-O further down the line or swap from a retirement Extension of Stay to a marriage Extension of Stay in the future.