Shaddow
What about getting someone to shaddow you in a fully equipped aircraft then if all goes tits up at least they know exactly where to find you ! (cost is one reason why not ) Getting to you in 20 mins from anywhere in the event of ditching is not a likely outcome. And yes a life raft is a good plan but getting into it if you survive hitting the water is the issue. There are a lot of very experienced ferry pilots out there so spend the time finding the right one(s) and see what they have flown previously. And despite all they say, be in an exposure suite like the military wear because you might not get time to change !!!!
Bottom line is if you like adventure go for it .I would.