So I decided not too look at comments during the hunt. I then got a "solution", but decided to wait a bit for something better to post it. And then I did not have time to post it. Well, silly me...

Anyway, because I have not seen this discussed (but maybe it was and I missed it?), here's my take on defending yourself from most ways to kill you. Note that this would not have worked for Harry for various reasons (as I said, my solution was unsatisfying), but I still think it could be debated.

Fact 1: Killing Curses cannot be blocked by magic or material shields Fact 2: Killing Curses can be dodged Fact 3: Dark Wizards don't go around murdering people from far away by just casting Killing Curses in their general direction.

From this I deduce that it is very plausible that any legal target from a Killing Curse absorbs its entirety. Therefore, since it can kill anything with a brain, pulling a Skitter and coating your skin in a layer of insects should do the trick. Harry could transfigure himself a platinum armor (against bullets and similar things) and an armor of insects.

The main problem I see with this idea in the context of Chapter 113 is that any DE can just Finite Incantem Harry's Magic. So it's a strategy better suited to epic-level wizards who have stronger magic than first-years at Hogwarts. Also, I thought it was too ambitious a PT fro 60 seconds, but then Harry did manage to stall successfully.