As slimy and nasty as DeSantis is, this doesn’t sound crazy. Who thought permanent alimony was a good idea on the first place? So you divorce, ex-spouse pays you, and they never get to retire or quit their job because you want their money until you die? Why not allow compromises or change? Even paying child support isn’t permanent.
Did he upgrade the head and handle? If so, it’s still your grandpa’s axe. Did you upgrade the axe? It might now be an axe of your own making. If “same” is extended not just to refer to the materials, but refers to fourth-dimensional quantum axe states, the axe stops being your grandpas axe the moment your grandpa isn’t chopping with it, but becomes his axe any time he returns to use it.