Hi,
so i tried again to set up everything (the 16383 output value was a big bug) and added MIDIToReaControlPath to the FX Chain, set up like in the screenshot on the post you linked.
Then when adding the shortcut for the action you said,when i press the pedal button that should be now a CC, nothing seems to work and i end up to having a <<MIDI PC 20>> shortcut for the action.
I'm going crazy with those problems.
This is the situation now (what i have wrote above):
https://ibb.co/b7dytw