It's unexplored territory. I'm not sure we can really say one way or the other. Like I said in a previous post, I have in my possession a couple of forks with broken steerers, so it's not unheard of for them to break. Those broke inside the head tube. Breaking above the headtube is far worse. Steerers see a lot more deflection that most people recognize. Weirdly, I have an 820 that's about to become part of the bike rack in my garage.

To the OP: If you were local to me, I have a frame and fork that I would give you that would fit much better than that.