Using this script and instructions seems to be the easiest way. To build this you will of course need the relevant Linux kernel sources for the Pi. My solution to this is to patch the Linux kernel with a custom "ir-mce_kbd-decoder.ko" kernel module. After some debugging and troubleshooting I discovered that the affected keys are missing from the keybit array in the input_dev structure for the driver. The problem I observed is that most of the keys on the keyboard does not send a EV_KEY event when monitoring with the "evtest" program, which in turn causes the key to not really work at all. At the time of writing, the Pi is running kernel version 5.10.17+ and ir-keytable version 1.16.3. I suspect there might be a bug/mismatch in either the Linux kernel itself or with the ir-keytable program. Now, this should have been enough to get it working, but in my case it didn't.
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