Interesting topic. Many of us have had a change in voice after radiation to the neck and some just from surgeries and/or Chemo. My feeling is this may be a can of worms you may not want to get into and accept the fact that your voice is no longer the same. Again, just an opinion. Sometimes we go down a rabbit hole trying to bring ourselves back to the way things used to be. But with every cure there seems to be a side effect. It will be interesting to see where this goes.