Finally I have three different sails for all weather. No pictures yet, I'm sorry. I will post some as soon as I can. All sails have their own carbon fiber mast with no shrouds. Only a single uphaul line. These stand alone masts fit nicely in a slot I made in the deck of my P&H Capella seakayak as discribed in some earlier posts. The sails are:
1) A Falcon 1m2 sail for light to moderate winds
2) A homemade sail madeout of super light kite cloth with two battens for moderate to stiff winds
3) An old worn down Flat Earth sail that can take very, very strong winds.
Why not just one sail that can be furled around the mast in case of increasing winds? Well, I have tried to make a furling system but it kept jamming in the mast slot while trying to pull the furling line. The mast just causes too much friction for easy turning. Besides, the old Flat Earth has a sewn-in boom so it won't furl at all. The other two sails are also attached to the boom by a clew line. You can't furl a boom, right?
I purchased three carbon masts for each sail rather than changing sails on the same mast. All sails have different heights so they deserve their own mast length. The only disadvantage is that I need to estimate the windforce before leaving shore. When in doubt I could pick the very forgiving Flat Earth that is slightly slower but will almost never cause a capsize. I survived windforce 8 till now on a small lake, which is why this sail is a bit worn and out of shape.