Hardest part to fake is Harry's sense of doom/scar pain/resonance: there probably has to actually be a Riddle in the Voldemort-body as it gets stunned, obliviated and transfigured. Better make sure it's a Horcrux V1 copy. So bring a V1 Horcrux, use it to overwrite the Voldemort body you create with the Stone, then possess that body on top of the Riddle already in there, then abandon ship right before the stunning hex.