Goodness! There's nothing to "change" here. Once the DTV is issued they're pretty much all the same and even if you applied under Muay Thai, nothing stops you from working remotely! Even some of us who applied under workation, like me, may change jobs, or stop working altogether. Doesn't matter! We're all good for 5 years.
It's a systematic batched process. I'm sure yours will be closed too in the coming weeks, if not days. Keep in mind there isn't a single button they can click that says "freeze foreigner's bank account if said foreigner is on a DTV or visa exemption". They're probably going account by account, and checking the documents used to open it. Definitely gonna take time, but the decision has already been made.
Not sure what you mean by "local immigration" but you need to do the TDAC before landing. Your host or landlord will do the TM30 for you. There's nothing to do at immigration really.
Nothing stops you from going to Thailand now with your current passport. As for the DTV, wait for the new passport and use that to apply for it. 2 months: come on.