Hi Iņigo,
I only studied this part of the firmware briefly, but it seems that there are already some provisions. See: \Sources\3.0\iRex\libs\erutils\src\display_utils.c . The code is used by the keyboard app: \Sources\3.0\iRex\erkeyb\src\erkeyb-display-sched.c.
The messages send by display_utils.c are handled by sysd (\Sources\3.0\iRex\sysd\src\display.c) there you can see what the effect will be from a message.
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