IFR in the USA is not a problem on an Exp aircraft like this.
But it's without an ICAO CofA so no chance over here.
It's remotely possible that EASA might one day bring in an Exp category but IMHO this is extremely unlikely. It would be totally against the European-regulation way of doing things and there is not the slightest indication it would ever happen.
Instead, EASA may bring in more and more 'ultralight/sports' categories, 750kg and maybe more. But again no indication whatever that IFR will ever be allowed in any of these; in practice this means you cannot fly instrument approaches.
Maybe something could be imported and operated under Annex 2 ? Can anybody familiar with the regs comment? Still only VFR of course.