The accelerator, brake and clutch pedals all pivot on pins that use either E-clips, or C-clips.
They are a royal PITA whenever you must deal with them.
There is another option often used to retain pieces to a shaft, the hitch/hairpin cotter pin:
These pins are much easier to use than the stock clips. They do require a drilled hole through the shaft.
With my pedal box sitting on my workbench it looks like the accelerator shaft has enough meat to allow the drilling of a suitable hitch pin hole. Or, as it is pressed into the housing, I imagine it could be pressed back out a little bit to provide a better drilling position. (Obviously, to drill a pin hole while this shaft is in the car is likely an impossible task.)
But for the clutch and brake push-rod pivot shafts, a longer clevis pin looks to be a workable conversion:
McMaster Carr stocks the sizes that would be needed:
Sent from me using a magic, handheld electronic gizmo.,