An ILS can't even then be installed as EDDF is too close and there is no space to legally design IFR procedures to EDFE until a few rules are changed.
Anyway, with the weather during the time of accident (EDFE 011750Z AUTO 03003KT //// // /// 08/07 Q1025) it wasn't even good enough for a CAT I ILS, nevermind RNAV or other IFR procedures. And to fly VFR in that kind of weather, well....