How did you get on? I’m normally pretty good with the re-arranged letters trick, even granted that it has been gently knocked down from its Internet bestowed status of being breakthrough research. Widell’s page takes it to the next level and I suspect that there are a few tricks that could push it further. For example, what if the letters didn’t respect word boundaries, or appeared to physically move up and down, or seemed to be in a font without strong differentiation between letters?
As an exercise, this is fun; as a life where writing you need to read starts playing tricks, not so much, I’m sure.