I found a piece of osage scrap that is hard as a brick to use for the new overlay, I bent the piece of scrap to give me some reflex but it pulled out on glue up. I will heat correct after I work the patch down to the bow dimensions, I used Unibond for glue.
When I ground off the old overlay I found a a glue joint failure, one side was starved, too much clamp pressure.
The new repair (hopefully);