Help in Developing an HMVC Module in Codeigniter

Hi,

I am integrating an API in Codeigniter project, I am planning to develop a module for that to give Admin full control over API. I don't want to change existing controllers, view and models of the project. I have few doubts if someone can help me, will be very thankful.

• Current application is saving Product information in own DB then call API Module (if enable), with ARRAY of product details.
  
• I want to create a Hook dynamically in CONFIG file which call my Module Controller Function at post_controller basis after running current controller function with display override as per my module's view.
  
• Module can contain multiple classes for different functionality like Order Class for Product Order, Shipment Class etc.