I have a ton of proliferations on NOID plants, I may play around with them and see if I can detect any difference in cutting the scape off above the proliferation. I would be surprised if the amount of green material above the scape actually provides much nutrition to the proliferation, not saying it does not provide some energy.
I actually would like to find just how early a prolif could be cut and saved . I tend to leave them too long and they often are dead when I find them again.