Treecutter,
I've done this in the past:

http://www.dennisleephotography.com/Dennis-Lee-Photograph/Boats/Klepper/n-p9swW/i-nfQs3nr/AThis was the same day I did this video, so you can see the rig sailing. Then I had to paddle home when the wind died:
https://www.youtube.com/edit?o=U&video_id=3ntblwQ2N1ISo everything that was mounted up top was tucked somewhere in the front of the boat. I used metal shower curtain rings to hold the sail to the mast. I also tried a rig where the sail was held to the mast with a continuous line, if there was an advantage to that... it has escaped me. I believe the shower rings won out though, and I'm guessing it's because they were easier to get on and off.
One thing that I really like about the BSD is that you can take the mast down easily and leave the lowest section (it's in four pieces) in the mast partner and simply drop the sail mounting 'rings' over the top of that mast section any you're done. The two piece Klepper mast makes this really hard to do... although it's still the easiest way to mount the sail.
With the continuous line version I was able to pull the sail away from the mast with a lot of slackening. Then the sail could be tucked a little under the coaming and the rest laid along one side or the other inside the cockpit. It's possible that I only did this for storage as I can't remember paddling with the sail tucked down onto my side... It was really quick to re-rig though.
One thing I can recommend for either system is to attach a line to the gaff hook long enough to hang down to the cockpit. The gaff hook would miraculously come undone all the time while hoisting the sail out on the water. Never happened on land, but always happened on the water. With a line tied to the hook itself you could keep tension on the hook as it rode up the mast until the sail was tight enough to secure it. This was very handy when rigging out on the water.
One thing I did with the BSD rig the other day that worked great was to drop the sail, crunch it all together, and then slide the carrying cover (bag) over the sail and boom and all the line, as far as it would go, then maybe made a knot around the mast holding it on. Then I swung the whole bag and sail forward onto the bow using a line running through the bow cleat and back to the cockpit to secure the 'package.' That actually worked really well in the MK1. Check the length, this might be something to try with the S2.
d