I don't know how I'd do that without redesigning the circuit board. I want to try just using "regular strength" LEDs. and see what happens.You could try rewiring the LED between the indicator output and the +5V supply. It sounds like maybe the LED is switched between 5V and 12V.
This is kind of the last remaining modification project on my list and the last thing I have left to get working right and then I'm done.