I know you say you want to see how people will attack it differently...but I imagine most will overthink it.
Well It is actually a nice challenge, the extended range that him publish is 64 BYTES long (512 bits).
I bet that half of the users of this topic don't have idea how to reduce or transform it to something solvable.
Even for me it was a little tricky to reduce it, my previous method doesn't work and I need to edit some of my codes to work with it.
I already have some method to reduce/rotate the key and I really like it, I learn some limitations of my current tools.