Thanks again @L37 for the excellent points you raise.
MCU pin mappings are exactly the same for Anduril and non-Anduril firmware, so they would have to be done exactly once. No extra cost here.
It’s virtually impossible to “brick” an AVR-equipped flashlight by flashing Anduril (or any other firmware) on it: if it doesn’t work, just flash a working firmware back.
The only possible damage in this situation would be for an enthusiast to flash a firmware that incorrectly supplied too much current to the LEDs. But the only case I’ve ever seem of this happening, was with a very specific batch of the TS10 and it could be argued that it was not the firmware’s fault but rather a hardware design flaw.
So, again no extra cost here (or at least, not any significant/probable cost).
There are probably more issues too, this are just ones which come to mind immediately…
If you remember any, please post them in a further response. I’m very interested in this subject, so TIA.