Legend, thank you!
Looking at this, I wonder if my cable is different to yours - I recall from another thread yours is aftermarket? Mine has a female Aux input with a mounting plate (pic below). So what I was thinking was I'd need to mount this somewhere (e.g. in the compartment under the climate control) and could then plug my device into it with a short male-male Aux cable.
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When you say you need to remove the aircon and gearknob trim, is that only if you are running the cable down to the ashtray or cupholders? If I'm installing it in the little compartment under the aircon I assume I have to remove the aircon unit itself, but not any other trim?