Hifiman HE6se (with a bit of EQ at 2k and 4k) is the best for me. Most natural sounding treble with deep and clean bass. I listen to pretty much everything. They do great on all genres imo. Some people may find them not bright enough and lack some airiness but I’m (upper)treble sensitive so it’s actually perfect for me!
I think you missed something here. Do you know if you put a tiny water drop in the microwave and it’ll never heat up? It’s too small compared to the wavelength so it won’t work. So even if the microwave wouldn’t damage your IEM, this method wouldn’t remove the water either.
A good solution is to put it in a sealed box with anything moist absorbing substance, like silicone gell or calcium oxide. Because the relative humidity of the surrounding air is going low, the water in the IEM would eventually evaporate.