How to tweak an XKB keymap without having to create my own under Wayland?

To access keys F13-F24 I recently needed to modify the file: /usr/share/X11/xkb/symbols/inet. This is the snippet, it's not all that interesting...

key    {      [ F13       ]       };
    key    {      [ F14       ]       };
    key    {      [ F15       ]       };
    key    {      [ F16       ]       };
    key    {      [ F17       ]       };
    key    {      [ F18       ]       };
    key    {      [ F19       ]       };
    key    {      [ F20       ]       };
    key    {      [ F21       ]       };
    key    {      [ F22       ]       };
    key    {      [ F23       ]       };
    key    {      [ F24       ]       };

After restarting the compositor this worked as expected. The problem I now have is whenever this package gets updated it will overwrite my local configuration. Everything I can find online explains how I can create my own keymap, which I'd rather avoid - I just want to make a small tweak to the existing keymap. --- Is there a way to overlay some changes on the existing keymap in my user configuration without having to create a new keymap?