The funds need to be seasoned for 2 calendar months not 60 days.
You can apply up to 45 days prior in some offices but as you know the funds wouldn’t have seasoned for long enough. Fortunately you can apply right up until the last day of your stamp (but this is absolutely not recommended).
The character recognition part of scanning your passport is known to be very sketchy. Double check or triple check everything or just enter it manually.
Bangkok used to have that rule a while back but changed. Now anyone can get a RC on any visa type.
Not many posts on here from people trying to use Nonthaburi so can’t confirm if they will allow or won’t. For many years i thought it was only Bangkok that had that stipulation.
stated you could get an RC from a nearby immigration office. You’d need a valid TM30 to do so for that province but stay a night in a hotel and get it from them.