You need SBK to be of any use. I very seriously doubt that moto will ever release the SBK. They really don't have any justified reason to. There is no justification for demanding them to release it. They can simply say that everyone is responsible for their own modifications of the device, and that they hold no responsibility.
According to rumor, Moto themselves either can't, or is unwilling to fix the hard bricks. People sending them in for coverage under service plans are getting completely new phones, not having their phones fixed.