EPCM with Approval Flow and Task Manager

Summary:

How to set up EPCM with Approval Flow and Task Manager?

Content (required):

I try to set up an EPCM process with a guided process like in task manager and to satisfy the 4-eye-principle with approval. As task manager and approval are not available in EPCM, I am experimenting with combining Planning and EPCM via connections and combining both products in one navigation flow so it appears as one to users.

Depending on the process step users access planning / EPCM and the data is copied to each product as needed. The data copy could probably be achieved with connection+data maps or business rules+groovy.