If you run sudo dmesg -w it should tell you the scancodes that each of those events is triggering. You can then create a /etc/udev/hwdb.d/50-my-device.hwdb file to map those scan codes to keycodes.
Here’s an example of a .hwdb file I made for Ayaneo handhelds:
You can find the appropriate evdev:* information by running sudo udevadm test /dev/input/eventX where eventX is the evdev fd for the device in question. evtest will show you the names.