Can TopLink CMP and POJO persistence be mixed (for incremental migration)?

Is it possible to mix TopLink CMP and POJO persistence in one application server container? Does anyone already have experiences with such a setting?
Background: We currently maintain an application that uses Toplink as CMP 1.1 provider for its entity beans. As this architecture is quite out-dated, we'd like to move from CMP 1.1 to POJO based persistence with TopLink (native, no JPA) and Spring inside the appserver.
Is only a "big-bang" migration feasible? Or is there a way to use CMP and POJO persistence with TL side-by-side in one container? That would extremely handy allowing us to migrate each entity bean at a time.
I would very much appreciate your input/opinion!
Sebastian
Application server is Bea Weblogic 8.1SP6
Toplink version is 9.0.4.9
Java version is 1.4.2

Thank you a lot for your answer!
I understand that with SessionAccessor from the oracle.toplink.ejb.cmp package, we can get access to the current CMP session.
We'd like to use the TopLinkDaoSupport class from Spring's TL integration and for this, Spring wants a session factory injected.
Is there a way to get something like a TL session factory for use with Spring in a CMP environment?
Thanks again for your time!
Sebastian

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