That is my main concern over the EIR. The expectations of ATC, and one is not going to retrain ATCOs around Europe to deal with arrivals like that.
It would make sense for the pilot to cancel IFR somewhere further back than the IAF, terrain permitting. Then the flight is largely like a normal long distance VFR flight, except one had an IFR clearance enroute.
Not being able to fly STARs is just daft, because they start a long way before the airport, and I don't think most ATC will be fond of VFR traffic in that airspace (the pilot having cancelled IFR before the STAR starts) - regardless of whether the pilot is flying along the STAR route, or is trying to drop out of CAS or whatever.
Same with SIDs, which are basically trivial (like STARs).
I have no problem with a rating which is IFR enroute only, but they need to tie up the end portions so they make sense.