A good bit of SACH does focus on relationship and the underlying reasons for behavior. Likewise, Creative Correction seems to look for alternative discipline solutions that don't cause as much pain.
However, until someone's mindset is changed into understanding what grace is and how it works, they can only move toward less punitive instead of truly graceful. That's why this is a spiritual journey - it's not about not spanking, but having our minds and lives transformed by the grace of God.