As with Rsh (restricted shell), the commands you want to run when chroot'ed all need to be made accessible first - i.e. in this case copy the executables for restore etc to some new area that is accessible to where you chroot to, and/or adjust your PATH.
If you chroot to /usr then you have all your stuff just down a new PATH.
Then as Michael suggests, if you make filesystems mounted off that with the
names of your old root mount points, you can move them around more easily later. E.g. /usr/home.
The whole ISO mksysb thing not parity-checking with me
