the only way i can really think of doing this is getting the instrumental and the acapella and then just cutting out the chorus and mixing it in. Other then that i doubt you could find instrumentals with the chorus in it but the verse not.
That depends on the artist pimpin. Some people do what you're asking KHAYREE "SELLIN THEM THANGS/COCAINE AS USUALL" has the hook/chorus segments in the instrumental.