Ah interesting, more to investigate.
I was batting around the idea
(wait, that might be too literally true) ... nm ...
of using the previous editions as base classes.
Call them something like:
Emanation of the Zero-ith Circle, from pre 1e original, idk squat about this
Emanation of the Uni-compoundword Circle, from 1e core
... semi-gestalt fixed workable, high bias toward say 4 schools only, paths via some of the monsters, Gray Ooze, Su-Monkeys, Brain Eaters
Emanation of the Second Circle, from the 2e psi book(-let)
... looks quite similar to 3.0e Psion but with more specialty and weirdnesses
Emanation of the Early Third Circle, the rest of 3.0e contortions, "Psi Is Borkt" etc
Emanation of the Late Third Circle, CPsi that works (Ha?!) as if CPsi was totally isolated