I'd be afraid to make it unbacked if rings are violated. Chasing rings on ash, hickory, hackberry, etc is difficult but not impossible. You need to view it with the light from just the right direction and angle to see where your rings lay as you go. It helps me to mark the edge of the
ring once in a while with a pencil, If you put it down for a break mark the ring edge so when you come back to work on it there is no question where you left off. It is a slow and troublesome task to chase those rings but doable. Hope this helps.
Greg