Send SA confirmation from SNC to ECC - Mapping in SAP PI

Hello Folks,

We have a requirement to send the scheduling agreement confirmation from SNC to ECC due to compliance need. I have implemented the SAP NOTE #810340 in ECC. Plan to use ORDRSP.ORDERS05 as inbound IDOC for delivery schedule confirmation outbound XML. Can anybody help me with the mapping in SAP PI or guide me on how to proceed with the build of the mapping. I know it is a big ask but i need help. We do not have SAP APO.

Another thought - Can I use SAP standard interface DELCONF.DELFOR01 (I won't have to build custom mapping) and redirect it to ECC instead of APO. Write custom FM to update confirmation from the IDOC to the system. Is it possible? DELCONF IDOC type does not exist in ECC.

I am SAP functional going to work with SAP PI consultant to achieve this requirement and ABAP consultant in case customization required in ECC during inbound processing.