Send Separate Remittance Advices

Hello All... We're currently looking at producing a custom remittance file (using R12) based on the standard "Send Separate Remittance Advices" concurrent program - this will be placed on the server for pick up by a third party system. In other words we would like the file to be produced when the latter is started. As far as I can see their are 2 ways of doing this: 1.) Via trying to customize the associated BI Publisher Template - although most discussions I have come across say this is difficult because the calling program calls the standard template via a hard coded