Ring end gap potential problem

Obviously I have to take the pistons out to do this but can I just take one piston out, file the rings, put it back in bolt everything up, turn the crank and go to the next one? Reason being is camshaft and timing chain are in and degreed, would like to do this without taking everything apart again. And can I use the same head gaskets? Heads are torqued down but obviously the engine has never ran.