....every FAA PPL/IR will have to get himself an EASA PPL/IR, and EASA is not proposing any conversion options whatever
That's not entirely true. The draft Annex III B. to the Cover Regulation to EASA Part-FCL gives the following proposed minimum requirements to convert a licence issued in accordance with ICAO Annex 1 to a Part-FCL licence, which are almost identical to the current requirements to convert an ICAO PPL.
1. Pass a written examination in Air Law and Human Performance
2. Pass the relevant skill test in accordance with Part-FCL
3. Fulfil the requirements for the relevant class or type rating
4. Hold at least a Class 2 medical certificate issued in accordance with Part-MED
5. Demonstrate language proficiency in accordance with FCL.055
6. Have completed at least 100 hours flight time as a pilot
It is true that there is no mention of conversion of an IR, although it would seem reasonable to refer to the requirements of Annex III A. in this regard. It is also true that the current wording seems to permit the issue of an ATPL with a Class 2 medical, but then it is only a draft.