If it doesn't code correctly, you will need to go to your bank branch and ask them for a credit advice which clearly shows the transfers as international.
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.