Most of the owners I know or have known are flying on straight FAA PPL/IRs. Their options are move to The Channel Islands, Isle of Man, Serbia, or some 3rd World part of Europe move to Switzerland or Norway (not sure if they signed up to EASA FCL) set up a non-EU “operator structure” (various threads here on Morroco, etc) get an an EASA PPL, EASA IR, EASA medical, the HPA, the TBM...