I second that, moving between BKK, KL & Singapore and don't have issues. Love each of these places. The easiest to solve your immigration issues is by basing yourself multiple places. Make friends with other nomads so you can swap condos everytime and your rental expenses stays low.
can I ask you something? I'm going to apply for the same visa. One of the requirements is "proof of payment for 60 night accommodation". Did you have this? I was just gonna book something on Agoda with the "pay later" option, so at least I would have a confirmed hotel booking, but did you actually added a bank account statement showing you paid for 60 nights hotel?
Same. Have you found a solution? I emailed them as well, but no response yet as it's weekend. Pls share once you were able to get an appointment there, I need one too for next month.