Find easy-to-read keymapping lists in /usr/share/X11/xkb/keycodes/symbols/pc.
/usr/share/X11/xkb/keycodes/symbols/pc
If this doesn't work, try keymaps.
Keymaps codes can be found in /usr/share/X11/xkb/keycodes/evdev. Swap the numbers to swap symbols.
/usr/share/X11/xkb/keycodes/evdev