So you have a hydraulic release bearing now?
Its pretty easy to convert then. The Wilwood pedal box has the 3rd master cylinder space available.
You'll need to be master cylinder of course. 13/16" is what I used and many others. Wilwood or Tilton, your choice
https://www.summitracing.com/parts/WIL-260-10373
You'll need a high pressure AN line
https://www.summitracing.com/parts/FRA-4121224BL
And a few adaptors
Also, you'll need to run a reservoir, of course
Too bad you already did the work for the cable, but I bet you'll be happy you ended up with hydraulic