I had a similar experience with that crusty baked thru rubber/plastic (or it was when new). I too broke the end going into the valve cover and the one on the opposite end headed to the turbo. I was going to replace them, but was able to fashion connections with larger diam. rubber tubing.
Not 100% sure but I think the bit that fell off into the valve cover maybe it bit bigger than you think, perhaps a 1/4"+ in length or so. I say this because if the piece going into the valve cover (#35 in the diagram) is the same size as the one is circled (#71) then you may really want to fish it out from under the head cover.
http://www.peachparts.com/shopforum/attachments/diesel-discussion/129148d1430858010-om606-brittle-rubber-ccv-bends-ccv-hose2.jpg