What's to stop you filing something like (EGKA - LJPZ) ......ILB DCT ILB250030 VFR DCT?
Or (LSZR - ?) DCT ZUE120020 IFR DCT TRA.......
(I'm guessing at the bearings in each case!)
Not quite as simple as typing wpt names into your nav system, but creating a personal VFR-to-IFR or IFR-to-VFR en-route waypoint by place/bearing/distance doesn't seem like rocket science to me, provided that you follow FPL conventions for the nations involved and that their airspace allows you to fly under VFR where you wish to?
Perhaps RMK/PILOT HOLDS EIR might also help - assuming that the ATS provider bothers to read the full FPL, of course!