This seems like exactly the sort of situation for which the new WAV file tool in the JP1 group was intended. I just don't know enough of the details of what you're trying to do to describe the details.

I understand you want to use a "T60" with a different unit code. I assume that uses a protocol for which KM can handle unit codes. I don't know if the whole upgrade you want already exists in our devices folder or just would be easy to create with KM.

After the upgrade is pasted into IR.EXE, the new WAV file tool could be used to convert either the whole eeprom image or just the upgrade area to a WAV file for the RS Kameleon.