Re: Reefing a headsail???
Squidd's scenario is your ideal, esp with hanks or a foil.. where we've made good use of a 'reefable' jib was with our smallest working jib (ie 90%) - on a previous boat we had a single reef in that sail, it was nice to have that 'next step' when we were down to a double reef main and the working jib already. Such sails, esp on a 27 footer are not large, so the 'rolled up tube' of sail at the foot when reefed is not that big a deal.
We left the original tack fitting connected, moved one sheet to the reef clew, then lowered the halyard, attached the reef tack and sheeted in all during a 'slow tack'. Then rolled up the extra sail into as tight a tube as possible and tied it all in. This does have to be fairly secure or it can shake out on the tacks. To unreef we reversed the process. It worked quite well for the relatively rare occasions we needed it - we were glad to have it.
1984 Fast/Nicholson 345 "FastForward"
".. there is much you could do at sea with common sense.. and very little you could do without it.."
Capt G E Ericson (from "The Cruel Sea" by Nicholas Monsarrat)