Rocket,
What aircraft would that be on? I am in the process of looking to do the same on my EASA TRI/TRE, thinking I could simply transfer a foreign IRE/TRE onto the EASA one. Wrongo. We now have to do a TRI course first through an EASA approved Flight Training Centre then after "experience" you apply to do an AE (authorised examiner) course. If your factory guy is authorised by EASA then hopefully that would be much quicker and easier but if you're doing it on anything that carries plenty of SLF then you might be in for a shock (I was).