The statement I want you to get changed is grammatical as is the alternative word order I want to get you changed, but the meanings differ. For example,
 Max wants Sam to get changed.
The meaning is derived from the word order: want + Sam to get changed wherein Sam is the actor, the doer of get changed.Meaning: Sam is to change
 Max wants (____) to get Sam changed.
The subject of to get is left empty: Max wants ____ (i.e., someone) to get Sam changed.Meaning: someone needs to change Sam
- He wants ( ___) to get this work done.
- either by himself or someone else will do the work
- He wants the work to get done/be completed.
- by someone else
Student or Learner