Change the password of administrator@vsphere.local on a stand alone SSO appliance.

Due to some issues that we have recently had with vCAC 6.0 we changed the administrator@vsphere.local password using the KB (VMware KB: Unlocking and resetting the vCenter Single Sign-On administrator password ) However we now have a 20 character password of random letters, numbers and special characters.

We are using a stand alone SSO appliance for vCAC which is not used by vCenter (so the vCenter Web client is out)

Is there any way to change the password to something more friendly? and how?

Thanks,