Someone just posted something similar to this.
Seems to me that you're inviting a ton of work going that route. You'd have to do some cutting and fabbing to get a master cylinder somewhere above the pedals, not to mention actuating it from your newly rebuilt cluster. Then run the line, and fab a mount for the slave cylinder. It's been done, but there is no plug and play solution. Seems like a lot of work to me for a small reward. But if you're into that sort of thing, it might be a cool project.
It's entirely possible your cable was weak before and now that the pedal assembly is doing it's job like it should, the weak link in the chain broke. I'd say purchase a new Terry cable and be done with it
As much as I like to fabricate things, I enjoy driving more!