This is a interesting topic, I'm not sure where any where near what the OP was thinking
but I see all the points in any of the above , it would really be no different in trap tillering a bow or adding sinew to a certain area on the back , or if you had a fixed belly lam thickness and needed to make a adjustment or tillering the back while reverse string prior to sinew , thickness is thickness regardless where it is in the wood in most cases its violated under the backing any way ,except in Patm example which still is a thickness change , when backing a bow the core becomes gender neutral so to speak
