Do you mean in a way that makes the stator thicker?
Or somehow break the coils out of the potting resin and wind around the diameter?
Either way it's a tough call. Probably hard to do neatly - but not impossible?
Then there's the connection - in parallel the coils have to match perfectly, while in series the resistance goes up -> less current guaranteed.
Is it any less work than just re-winding new coils? No, it would take longer and making fresh coils would be much neater.