FWIW, if you can contact that to a piece of RC paper, you can then put that paper in your enlarger and project it just like a film negative. However, you'd want to go *low* contrast for that, so as to be sure you don't clip the image range once you do finally manage to expose enough to get something on the negative; given 4x5 sheets of paper are pretty cheap, you can always punch up the contrast a bit if needed.
The bad news with this method is that with VC paper you'll get only the green and blue channels (the ones you discarded to get the above B&W image), and they'll have wildly different contrast -- IOW, you'll get an image with a really wonky curve (technical term, there) as well as lacking all red information.
I'd suggest sandwiching the negative in front of a piece of B&W panchro film in a film holder and then exposing in camera against a flatly lit white screen. You might have to bracket a few attempts, but I'd start with five stops off your usual EI for the film in question, metering the lit screen at Zone V (i.e. don't open up from the reading). Shouldn't take more than four iterations, at most, to get an acceptable negative that can then be printed the old fashioned way...
Alternately, if you know a *really patient* pro lab, a cibachrome from this frame would probably come out almost normal...
