How do I configure F5 to serve"internal and external" views from a LDNS?

We are taking BIND out of the F5 and moving on Linux servers behind the F5. Clients and servers will continue to point to this existing F5 as forwarders because we do not want them to use BIND on linux for security reasons. We were using internal and external views on F5. What is the best way to deal with this situation where internal clients continue to point to F5 and configure F5 to pull zones from LDNS ( BIND On Linux) without using internal BIND. We will use DNS Express for external zones answering the queries from the Internet how do we configure F5 to give Internal views to Internal clients while performing recursive lookup for internal clients as well.