Solved:
*create "your_keymap.toml" from Scratch.
*create an /storage/.config/autostart.sh with on line:
--ir-keytable -c -p rc-5 -s rc0 -w /storage/.config/rc_keymaps/your_keymap.toml
*disable the automatic load by creating an empty rc_maps.cfg
--touch /storage/.config/rc_maps.cfg