Krimson,
Short answer, no. Under the old system (UK CAA and others) you could get a dispensation to fly for a year but you still had to do the exams to continue flying. Occasionally, an airline will take another airline's crew for a fixed term (eg easyJet took some Qantas B737 FOs for a year or so) but in the main, there's no other way other than doing the conversion.
There are some N reg bizjets running around but I believe soon they'll have to have EASA licences. There's some stuff about that in the GA forum. I'm not sure of the details as I have an EASA/JAA licence so it doesn't affect me.