I am in the process of converting to a cable…using a bicycle brake cable and sheath. I have fabbed up an intake manifold-mounted bracket so far, with a small pulley to keep the cable aligned. My car did not come with a gas pedal and associated pivot so I felt free to design my own system, though I do have the other rods and brackets. Am not at the point to go much further right now, however. I will probably source a junk yard, cable-style pedal at some point to tie everything together.
My experience is that a cable system is smoother and more precise than rods and pivots so I applaud your efforts.