When I design spell books I often worry about the Warlock aggro build. Not because I encounter it often (I don't play that often), but because I feel that a well-rounded build should have an answer to this. I don't want to design specifically against this build, however.
So, how would Whirling spirit (for the push+incorporal) + enfeeble do for a relative simple way to slow him down? Perhaps with a Jinx to delay the dispel. That combo might also have uses elsewhere.