Paul,
very well thought out, and thanks for the pics. Lovely setting you are in, too.
Two comments, if you permit: Your single rope solution, neat as it is, could not really work for larger boats where the diameter of the sail clew rope would need to be a good bit thicker than that of the furling drum rope.
And, the s/s eye fitting holding the furling drum to your clubboom, I myself would fasten that to the boom using through-bolts, as the mast and entire rig is held by it.
Otherwise, great.
C.