Less overhead calling stored procedures (on z)?

[Truusvlugindewind]

I'd like to launch an idea of mine:

nowadays I'm coding COBOL stored procedures which are being called from WebSphere/java, other cobol programs and other cobol stored procedures.

It seems to me that cobol calling cobol by means of DB2/WLM generates a lot of overhead. But sometimes, when generating a result-set as output, it is mandatory.
But, when the output is represented as parameters, you might call the procudure the oldfashioned COBOL-way.

The company I work for is not open for that discussion right now. So, modest as ever, I want to discuss this with you: the rest of the world

There are a lot of issues with compile/link/bind described here:

http://www.redbooks.ibm.com/redbooks/SG247083/wwhelp/wwhimpl/js/html/wwhelp.htm

Suppose you've read it all and managed to compile/link/bind your stored procedures to enable both DB2 and COBOL calls.

Then you could call your procudures/modules like this

900-CALL-STORED-PROC ECTION.                                
900-10.                                                     
    EXEC SQL
      SELECT  LANGUAGE ,  EXTERNAL_NAME  ,  RESULT_SETS
        INTO :LANGUAGE , :EXTERNAL-NAME  , :RESULT-SETS
        FROM  SYSIBM.SYSROUTINES
        WHERE OWNER         = 'S'
          AND ROUTINE_TYPE  = 'S'
          AND CREATED_BY    = 'S'
          AND NAME          = 'ABC'
    END-EXEC.
    IF  LANGUAGE    = 'COBOL'
    AND RESULT-SETS = ZERO
    THEN CALL EXTERNAL-NAME USING W-PARM01,
                                  W-PARM02,
                                  W-PARM-NULLS
               
         END-CALL
    ELSE EXEC SQL
             CALL 'S.ABC'      ( :W-PARM01 :W-PARM01-NULL
                               , :W-PARM02 :W-PARM02-NULL  )
         END-EXEC
         IF SQLCODE = +466
         THEN PERFORM ASSOCIATE-ALLOCATE-FETCH-CLOSE-ABC
         END-IF
    END-IF.
900-090.
    EXIT

This is a theory and the code should be read as 'pseudo-code'.
Is there anybody out there who is able to test this. Tell me if it works and give some performance figures?