I haven’t been experimenting with the textSelector motionscripts, so I prepared a motionscript using one layer per letter:

there’s a hidden text-layer that has keyframes for sourceText with the different phrases. Just the duplicate the letter layer as much as you need it.
the first layer in the comp is a null that has a few controls: text-tracking, text-center, and the amount of hopping over each other.
It renders extremely slow though, so be sure to convert the expression to keyframes as soon as possible. Especially Motion Blur is a disaster.
there are probably numerous bugs, (for instance, as sooon as you throw away the “ANAGRAMS”-layer or delete all of it’s keyframes, you get tons of errors.
And there’s probably sopme way to speed it up a bit?
download the project file:
anagramscript.aep