The "proper" way would be to change the resistors
Do correct value resistors cost too much money or something?
I peeled the hideous label off my Realforce only to find that the LEDs don't fill the holes, but instead the holes are empty and the LEDs sit right down inside the keyboard. (Fortunately the label is really thick and strong and went back on again almost as if nothing happened, barring the knife wounds.)
My monitor has a mid-blue power LED that's not too bright (though for fun I've turned it off), and current Dell keyboards have deep blue LEDs that are also perfectly tolerable, so why expensive keyboards get this wrong, I don't know. Plenty of devices have blue LEDs that don't suck. Also, those solar-powered garden lights with tricolour LEDs have a curious property that the blue output is much dimmer than the green or red phases of the cycle. Maybe newer ones have fixed that.
On the other hand, Cherry G30-8000 green LEDs barely show up ...
No, resistors are cheap. Perhaps $0.09 if you get really expensive or nice 1% tolerance ones. You can get cheap 15% or 20% tolerance resistors that will work just fine for even less.
The hard part is desoldering the resistors, and knowing a good value to replace them with. In my WASDkeyboard, the resistorsa re surface-mounted: A pain to desolder! Any higher resistance value will allow less currant to flow through, and the LED's will be dimmer. If you pick one that's just a little bit higher, you probably won't notice the change. If you pick a value that's twice as much, you will probably see a difference clearly. Getting it right might take a few tries.
What you could to is add another resistor in series with the LED. Finding a place to put it might be hard, but you can get away with thelarger (and easy to work with) through hole resistors if you do that.
You can find some LEDs that are higher voltage (and thus lower current) or lower brightness that might work, and will be cheap (under $.50 probably) and might work.
Perhaps there are people on the forum that can offer modification services, and will help you.
I believe WASD is making the LED's dimmer on his version two which should come out before the end of the year.