I believe the original question as around taking the Iinstrument foriegn written. If adding a JAA/ICAO IR to a 61.75 then it is just the written test and an IPC. No medical or training required.
If wanting to add a full FAA IR to a 61.75 then it is not the IFP written it is the full FAA IR written, training as required and a check ride along with a medical.
If a full FAA certificate a non FAA IR can't be added by doing the IFP it must be the full IR written, training and test.