You can do what you want in terms of a freewheel but, honestly, what's the sense in trying to salvage a freewheel that is already damaged? Take apart the freewheel, corralling all the ball bearings (they are extremely small and easy to lose and there are about a million of them), removing the body from the hub without damaging it, then cutting new slots into a freewheel body that is already broken and reassembling the freewheel seems like a lot of effort for a freewheel that can be easily replaced with something that costs $8 to $15 new.

I rebuilt a freewheel once. It was an interesting experience but taught me that they just aren't worth rebuilding.