We were worried about Singapore too, but the only hairy part was crossing the channel near Horsburgh, when entering the South China
Sea. The ships seem to go full speed there and the distances between them were just enough for us to get through without getting too close, but we are making only 5-6kn, so should be piece of cake for you
Around Singapore we also went close to shore. Just watch for the currents, that you probably know. I remember it is written somewhere to contact the authorities about crossing the channels, but we didn't.
Also we don't have AIS
and the ships that were aiming at us didn't seem to notice us at all.
South of Hornsburgh, we sailed straight for Kuching (actually Santubong) and didn't see almost any traffic. Just dolphins
and couple of fishermen near Borneo.
And Kuching is just lovely!