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From /usr/share/doc/systemd/NEWS from the systemd package (udev has been merged into systemd):

  • The udev "keymap" data files and tools to apply keyboard specific mappings of scan to key codes, and force-release scan code lists have been entirely replaced by a udev "keyboard" builtin and a hwdb data file.

Have a look at /usr/lib/udev/hwdb.d/60-keyboard.hwdb, at the top there's an explanation of the new system.

That file actually has this in it:

# Microsoft Natural Ergonomic Keyboard 4000

so that makes things easier for you, just take those lines and put them in e.g. /etc/udev/hwdb.d/70-keyboard-custom.hwdb (create /etc/udev/hwdb.d), make the changes you want. Next as root:

udevadm hwdb --update

to create an updated /etc/udev/hwdb.bin, then just unplug/replug the keyboard to test the changes.