I also had to remove the parking brake setting bar from inside my frame rails. I moved it to just outside the frame rails. I remade it a little longer and from a little thicker steel, and routed it through a slot in the front face of the footrest panel. I relocated the factory tension spring to up underneath the footrest panel. For setting the parking brake, I added an extra "inner" brake pedal. It works really smoothly.
The horizontal bar has a cog cut into it such that when you lift up on the rearward end of the bar while the pedal is pushed all the way down, the cog in the bar clicks up and engages against the top of the slot. With the bar thus engaged, the brake pedal is locked in the full down position.
The "extra' inner pedal applies tension to the visible "lifting" spring as the brake pedal travels forward. So if you put your foot on that upper/inner pedal and push down, you'll hear a click at the end of pedal travel, the the parking brake is now set.
If you then push on the "normal" pedal, you'll hear a click, and the parking brake is now unset.
View attachment 127822
View attachment 127821
If you wanted to go this route, you may need to upgrade your older style brake pedal to the newer style.