The full Remus still has the exhaust flap valves in it? If not then it doesn't matter if the cables are disconnected. Just plug in the O2 sensors and let the shop disconnect them and remove them. Make sure they are connected to the proper sides.
Pretty certain (99%) that disconnected O2 sensors won't throw a fault in the instrument panel. Otherwise all the guys that have PCVs on their bikes would be riding around with an engine light on.