Yes, start the monthly transfers immediately because Norway will stop issuing the papers soon. You need the paper trail to be completed for 12 months already for next year's extension. But you can just use the paper from the embassy for this year.
Doesn't matter what the situation is, do not go to Poi Pet or you'll most likely be denied entry back into Thailand and find yourself traveling to the airport to fly back. Pick a different border or fly somewhere else and back.
they will not excuse the charge. There is a built-in 7 day grace period. If you failed to report you failed to report. 7 days more than makes up for weekends and holidays. There's no additional time granted for 90 day reports.
Just go on your holiday and then it's a
*****
chance they ever even notice you missed your report.