If you want full frame the Sony A7 series is the way to go. There are adapters for all kind of mounts, I expect you can find an adapter for the inner mount to Sony FE somewhere on Ebay.
If you don't mind 1.5 crop, an APS-C A6000 would be a cheaper option, or one of the Fuji cameras (I don't expect you can find an adapter for the Samsung NX cameras, but if you do, it also would be an option).
As somebody else already mentioned, I wouldn't bother using your RF lenses on a Nikon 1 series due to the huge crop-factor.