It was that simple but I did not see the apple within the reach of my…foot! For the use of 3 expression pedal without the limit of midi channel bound to the part, easy setting;

i assign to the midi pedal cc95 channel1, it is my midi pedal which control the SK

I Assign cc1 to the fc2 entry (the fc1 still using cc11)

i now have two meta controller under my feet. 

i will not use this set up for now as my actual repertory have been made without this third pedal and don’t need this extra sugar. But for the next one, I will program this new skill definitely.