Alternative spice model of TI CD4066b
How about Simulating the CD4066 Quad Bilateral Switch With LTspice: http://www.embeddedcomponents.com/blogs/2011/12/cd4066-ltspice-simulation/? (archived link)

Or use faster switches with lower Ron here: http://www.analog.com/en/design-center/simulation-models/spice-models.html.
Bipolar supplies are useful.  

Maybe the ADG4613 but the reason they don't have a model was the specs were so loose and supply sensitive (old technology).