Originally Posted by MumOfThree
It's certainly very difficult to change motor memory, which is what handwriting becomes. I don't think it's so much that it can't be done as that it can't be done trivially - it may require intensive practice (which may be resisted) and supervision (which may be hard to come by).

I agree with this.

It's basically possible to change anything in terms of motor memory as long as you want to put in enough time and enough effort in the proper manner.