Any camera can be cloned and set to do whatever you may need it to do. In the case of a PTZ it should only be controlled, PTZ functions, from one instance and the other instance will be limited to the view of the "master".
There are Dahua, and Hivision for that matter, varifocal bullets with higher powered lenses. Check with Andy,
@EMPIRETECANDY , for models, resolution and focal lengths. They would be less expensive than a zoom but more expensive that a "standard" varifocal.