great that you're approaching the problem from different angles.
and an interesting idea about the botox... yes, let us know how it works if you decide to go ahead with it.
my only thought was that the botox mith release the anal sphinchters so much that you're then gonna have to deal with encopresis (involuntary defecation).
is there anything on the net about this treatment being used like this?
good luck with it. hope it works.