Ohhh I see Malaysia is a bit different from me When #4 was in flowering for me Sun time here at longest is about 15.75 hours buds where easy to see and nearly ready to open and did so with lesser sun light time and finished flowering 12 days later. Temps where in the 80 - 92 F range at the same sun times mentioned and the time of day mine opened was 16:00 hours to 23:00 hours For now I can say your heaviest rain season might be a bit much for #4 although the soil you have it in does look nice enough to drain fast enough. Again odd #4 Messeb like water more than most succulents but doesn't like wet roots for to long of time in days the top will rot out on you if to wet to long. Your other plants would certainly benefit with a lot less water than #4 can handle Other than a season rain over watering concern I have think you'll do very well with yours. As caution I think it would be best if you could provide a tarp or tent for some over head covering during your heavy tropical rain season over the entire garden bed. I and others here appreciate you and want to see your plants in there best of flowering later too. In all honesty it's best to tell you to talk to some of your local people with the same succulent garden passion as yours and ask them what they do.

Both are Echeveria. Neither is monocarpic. The first looks similar to the hybrid 'Truffles'. Better pics would help ID.

the former is one of the showier forms of Oxalis, and it's either a life-saver of a groundcover, or a bloody nuisance, depending on what your tastes are. I have a pink-flowering type with green leaves, and the burgundy strain you mentioned, and I find them wonderful company everywhere BUT my succulent bed the second one is a mystery to me, unless the leaves are distinctly fleshy, at which I would say it's 'one of those prostrate sedums' and leave it at that.

Definitely not Garlic Mustard, it does not spread vegetatively (thank goodness, it's bad enough as it is!!). Definitely not Wild Ginger, at least not the native one. Unfortunately, I don't know what it actually is! Reminds me of some Campanula I saw in another thread, at least that's the best ID they came up with (on Name That Plant). Doesn't it ever flower? Here is a link that might be useful: Very invasive but what is it?