Aneesh,
In general I would say you can't do what you want in the simple manner you want when you exclude the DB2 command that does it but..
1. Have you tried setting the package name as a BIND variable in development centre when you build the stored procedure?
2. Have tried setting the FUNCPATH as a bind variable as I gather the SET PATH would also not be appropriate for you. You can also set schema and funcpath in the ODBC/CLI config file for the database connection.
Did have time to test these but they may work, I could work exactly what you want question 1 to achieve.
Tony Winch
www.datasync.com.au