i wish there was someone out there with enough digital tools to recreate the original version, but I doubt that, since there's no one I know has successfully colorized black and white footage.
A Youtube user named Babelcolour did an astonishing job colorizing old black & white clips from Doctor Who, but it was only short scenes not full episodes. The work was very
convincing, and it proves to me that it can
be done, but on a project like The Cage I'd imagine it would be cost prohibitive. Especially when there's an 'almost complete' full color copy already.