How do I handle InterLink DX Conflict?

Regarding " Converting Twin Otter RF9.5 Aircraft for ArduPilot" in video https://www.youtube.com/watch?v=YjfZYP7364I :

We have configured the model to put the Flap Servo on Channel 3. But the InterLink DX Simulator Controller is hard wired to use Channel 3 for Throttle. How do we resolve this conflict?