Have you tried mirror therapy at all? Theres early work being done (thats pretty similar to whats been done the phantom limb pain), where patients move their unaffected limb whilst watching its reflection in the mirror. It thought that the reflection can compensate for the altered sensory feedback being received from the affected limb

Whilst using the mirror the patient will do specific exercises (eg wrist flex/ext) with the unaffected limb and with the affected limb as able. A colleague of mine found a drastic effect in her patients ROM when this started.

Initially the response was only during the mirror therapy but the patient was advised to continue with it at home and the length of the improvement progressively increased.

However, the stuff Ive read so far does report that this works best with early and intermediate CRPS (<1 year). The results werent great with patients with chronic CRPS unfortunately.