I haven't used SDMs in many years, but I'm certain an SDM will slip up the luff tube fine.
Its completely up to you what sails you decide on, but why not try the Gators first? There is a program up and running where you can contact your local Gator Force team rider through the Severne website and try out his or hers. Check it out...
I would keep the Blade and just throw in a couple of Gators to give you a full quiver, remember its all about quality water time!