You may be interested that some time ago i placed a post on how to fit a third reef to the mainsail of my B34 with all reefing lines back to the cockpit. You are probably aware that the third reef cannot be incorporated within the single line system within a boom due to the length of reefing line required to draw the main down to the third reef position.
if you are interested and fail to find my previous post, which will have been several years ago please get in touch and i will compile again.
Ours has been in use for 5 years and works. we never have to leave the security of the cockpit in a blow.
alan & Sheila