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Access data from lookup field on new case page

I am working in service cloud.

I want some data to be displayed from contact when contact is selected(from a loookup field) on new case page. 

I cannot do it as a embedded vf page as I cannot see the embedded page on edit/new case pages.
I cannot override the standard new page to custom vf page as its not want client wants.
I cannot create a formula field as it will not display value in new page.

Is there any other way we could do this? Any suggestion/help is much appreciated.