There are many variants, right? XA2 variants, 10, 10II, 10III, all different hardware. The IV and V are the least different of them all. There must be code to turn the pixels on and off, but after that, I think it should be very, very easy to implement. A small update in the subroutine, if dededicated_indicator_exists then … else … and point to the right code to display. Everything that needs the indicator can then just run indicator_blink() or something like that. No need for different OS variants, because no one will really notice those couple hundreds of bytes, and just push the code that lights pixels to phones that will never run it as well. But again, I might be wrong about this. It just intuitively feels pretty easy to change the existing code to let it run the code you need.
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