Friends of ours have the same boat as we (42') and tried to impliment single line reefing led to the
cockpit. Unfortunately, even with a block attached to the luff reef cringles, there was too much friction to be able to get a good set on the sail and they abandoned the system after one
cruise. While your boat is slightly smaller, your main is relatively larger and may be about the same size as ours so you may have similar issues.
Like you, our boom has shives on the
outboard end of the boom and at the gooseneck/mast end, with clutches. We also have a #40
winch mounted on the aft side of the mast below the boom with which to tension the
outhaul, reef lines. (If you have turning blocks at the mast base, and a
deck mounted winch--thay may be an alternative design for your system.) At the luff, we have straps with rings through the luff reef cringles that attach to reef hooks in the inboard end of the boom. Our
halyard, which is pre-marked for each reef, is led to the cockpit. To reef we free the vang (rigid Garhaurer), ease the mainhalyard to the pre-marked position, haulin and tighten the leach reef lines and lock them down and set the luff cringle over the hook. (All the foregoing takes more time to describe than to do.)
FWIW...