Yes, I think it's much easier and cheaper to AC couple. A charge pump requires two extra capacitors anyway, then there's the extra board space and cost for the IC.
An analogue switch can never be treated as a pair of dry contacts because it doesn't behave as such. The voltage range is limited by the supply and the on resistance changes, depending on the signal level, which will introduce distortion, if the load impedance is low.
You might be able to use the existing capacitor in the pre-amp but if it's polarised, it might need to be reversed.