That doesn't sound good... I think if the main or fuel injection circuit fuses are blown the fuel pump wouldn't run.
Unless you have knocked the killswitch off that leaves the ECU as a likely candidate. I don't know the FZ6, but get the feeling that the immobiliser and ECU are a single unit... if that's the case, swapping in another to check the ECU isn't going to be a simple job.
Once you do get it running again, check the regulator survived... if that was in circuit when you offered the battery 24V it might well have got cooked too.