Custom Keyboard Layout and FN Mode

Hey folks, how can I make use of a custom keyboard layout? Is there a "workaround" for the immutable system that survive reboots? Second, my custom keyboard will act like an keychron with apple FN Mode in place. (FN + 1 will lower the screen brightness instead of F1). To alter this I normally can use this "echo 0 | sudo tee /sys/module/hid_apple/parameters/fnmode" but again, with the immutable system I think this doesn't work. How can I workaround over the two problems?
Solution
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