Hi Abishek,
What is your customers' request in this case? If your customer is reluctant in to invest in the HANA db, then I suppose you are referring to acquiring the HANA machines? A better option, in this case might be moving you DB to a hosting provider. These will be able to provide a scaleable hosting solution based on a monthly fee, reducing the need for investment. The extra fee that needs to be payed for the HANA licences are due to the fact that you get a Db solution with it. On the other hand, your customer will lose the license costs for the Db that is already installed under the current ECC system.
Besides this, S4HANA cloud might be an alternative, but still only as a complete replacement. What you can do is move to simple finance in the cloud and to a HANA reporting solution in the cloud, to better suit the needs for certain LoB's.
Please keep me informed on your progress. I am very eager to learn more about this.
Regards,
Sjaak