The place where I found the other one had this Plumb in the yard today.
Bringing the heel up to match the toe better is gonna take off a lot of steel. If it's an insert axe that may risk running out of steel.
But on the other hand: orphan tool, not expensive, still has some life in it. I say go for it. At least then you'll know.
I'd probably go for a straight handle, personally. With a straight single-bit I can put the axe where I want it. With a fawn's foot handle I'm like lightning; never strike twice in the same spot.
O.H.