you could try inarching to multiple thin-caliper rootstoc as others have mentioned, but might be too much work. If you decide to ply this route, would be best to prune as many of the canopy’s branches(as much as you could bear to lose–painful that might be), as it increases chances of survival.
some pics were shown on this thread-- What “grafting” technique is this?
also best to wrap the exposed sapwood with saran or parafilm to minimize exposure.
also notable is that during spring, when trees start to leaf out, movement of carbs/proteins is from rootstoc to buds. Your apple tree might do well initially—until the sugars/proteins, etc have been used, so the rootstoc soon starves since sapwood xylem is practically a one-way conduit. Inarching will give the tree new roots, if the callus formation is too far and isn’t fast enough to connect phloem to the original rootstoc.
bark-grafting at the proximal site of the damaged bark of the original rootstoc may also help, to somehow provide the old rootstoc access to solar panels – the subsequent foliage of the bark-grafts.