How to override JDBC Adapter

We are planning to upgraded Oracle 10g driver on our webMethods IS. But we have some integration that connects to Oracle 7.x version. There is a ongoing project to migrate older version of oracle. But it will take a year or so. Now, the criticality is 10g driver doesnot supports 7.x versions.

Is it possible to Over ride the JDBC driver from package level. Any suggestion to handle in easier way?

Thanks in Advance.