I have a 2005 Outback (love the secondary stability - much better than the newer Outbacks). I don't think you can put a twist and stow rudder on it - the hull is different. It has what I think is a more dependable rudder system, although you will kick it, hit it and run into it all the time. When retracted, it's in the way. Nature of the beast I'm afraid.
Take note that your current rudder has three positions - up/lock, down/lock and down/unlocked. I run mine in this last position so it'll kick up if I hit anything.
Most all these boats will run just under the waterline if filled with water, but not if you have yourself and any gear in them - that will sink one. So some additional floatation is never a bad idea.