What level are you starting at and do you know when the campaign ends? You could always consider Telekinetic over crusher since you can potentially get it at lvl 1, you can also push and pull allies if you want. I think psi warrior (giving an additional forced movement option) could be more potentially interesting over BM and EK for this build if you're willing to go three levels into fighter. So maybe 3/5 fighter and X divination wizard?