If your transmitter supports mixing (I'm not familiar with the Optic 6) you can mix the elevator channel to another extra channel (e.g. 5) and reverse it at the same time. Then the second elevator half gets plugged into that channel (ch 5). When you move the elevator stick, both halves will move the same direction. One issue is when you move the elevator trim tab. Depending upon the transmitter, it may or may not affect the slave channel. Ideally, the trim tab will affect both channels as this is what you'd probably want in flight. I have flown planes where the trim tab only affects one of the elevator halves and this works fine. You cannot tell with minor trim changes that only one side is moving.