As you have identified, the SL drone laws are pretty draconian. I was living there for a few years until recently and brought my Mavic in Singapore and carried it back into SL around December 16. At that time there was no regulation other than all of Colombo is a NFZ. Since then, the laws were updated a few times to the point where you basically mean you need personal permission from the Dept Secretary of Aviation (spoiler: that isn't going to happen). I learnt how serious they were when I did a flight around Galle Fort and got some great footage and was then detained and questioned from the local civil defence. Apparently the new laws were enacted only a couple of weeks earlier and the apps and online regulations hadn't been updated. I got let off as they hadn't published the updated laws clearly and in English at the time but my advice would be leave the drone at home. Sorry the news isn't better.