This is just an FYI for anyone else who might be in the same position.
We are so close the being done with the whole process. We are currently waiting for K1 Visa appointments to become available in Bangkok.
On September 17th, we completed the DS-160 forms (By the way..that was a SERIOUS PAIN IN THE _.since the https://ceac.state.gov/ceac/ website kicks you out if you pause for a minute to look up some information)
After completing the DC-160, you get directed to the ustraveldocs.com website to pay for and schedule an interview. (Why that website doesn't have a .gov domain extension is beyond me). At the time, the ustraveldocs website was indicating that there was an available appointment at the end of November. (I'm guessing it may have been a cancellation that freed up a slot).
Unfortunately, it took much of the next day to find a print shop in Jomtien willing and capable (incompetence was a factor) to print out the payment form that the bank would need. After paying for the interview fees (k1 and k2) and getting our receipt, per the instructions, we had to wait until after 12:00pm the next day, before attempting to schedule an interview. (I assume, giving time for the ustraveldocs website to acknowledge the payment Receipt #). To our dismay, that open slot had been snatched up (congratulations to whomever that might be).
So here we are, checking the ustraveldocs website constantly, hoping that more appointments open up, soon. It's quite disheartening, after waiting 15-16 months from I-129f inception, to our case arriving at the embassy, then struggling through the <text deleted> CEAC website, to now get greeted with "No appointments available" every time we log in and click that 'Continue' link.