Dear WW: you remind me of a character disorder who hid out from prosecution by faking symptoms to get into mental hospital. Long enough ago that they had several catatonic schizophrenics, who were like living wax statues. He would
manipulate them into ludicrous positions which they would
maintain until on rounds profs and students would find them
and wonder how they got that way.
As far as cataleptic is concerned, there are neurologic disorder with some similarity to epilepsy, but without the motor component.