Access "PrepareCustomerInfoModel" method in CustomerController.cs from Plugin controller

 protected virtual void PrepareCustomerInfoModel(CustomerInfoModel model, Customer customer, bool excludeProperties)
{
//
}

 protected virtual void PrepareCustomerInfoModel(CustomerInfoModel model, Customer customer, bool excludeProperties)
{
//
}

[ActionName("MyCustomAction")]
      new public ActionResult OverridenActionName(params) {
            ...
            this.PrepareCustomerInfoModel(args);
        }

...

protected override void PrepareCustomerInfoModel(params)
{
//if you need to alter code in the original method,
//you'll need to recreate it here, otherwise you can simply call the base method when needed
base.PrepareCustomerInfoModel(args);

}

            routes.MapRoute("MyCustomRoute",
               "route/to/intercept",
               new { controller = "CustomCustomer", action = "MyCustomAction" },
               new[] { "my.namespace" }
            );