I have looked and discovered a range of switches which seem to be an industry standard, eg DG201, DG451 and so on, they are still quite expensive and they are single pole single throw mostly, whereas I was looking for one pole four position or six position type of thing. The lower the Ron the more expensive they are in general, although it appears Vishay is much cheaper than AD.
So I designed a silly diagram of a mosfet switch using N-channels. It has great drawbacks, it needs a Vdd much higher than the highest peak of the analogue signal expected. And if I use P-channels, again, I would need a Vee much lower than the lowest peak of the analogue signal.