Has anyone customized the R12 Separate Remittance Advice to set the sent from email dynamically?

Has anyone customized the R12 Separate Remittance Advice to set the sent-from email address dynamically?

Usually this is read from message  IBY_FD_SRA_EMAIL_FROM.  So you can only set one value (per language).  But different parts of our business want a different sent-from email address to go out on the remittance.

For the email subject you can use message IBY_FD_SRA_EMAIL_SUBJ with the payment reference number being set dynamically e.g. Separate Remittance Advice: payment reference number - &PMT_REF_NUM

I think my only option would be to customize the IBY_FD_SRA_FORMAT: Send Separate Remittance Advices java concurrent program, but I would prefer a less intrusive change.