You would really need to be using fractional BAB from UA for it to work out. In that case, something like...

Rogue 1/ Spellthief 1/ Psychic Rogue 1/ Sneak Attack Thug 1/ Ninja 1/ Assassin 1/ Psychic Assassin 1/ Bayushi Deceiver 1/ Unseen Seer 1/ Swordsage 1 (assassin's stance)... you get the idea.