You can purchase a second docking cage for home use, yes.
Once you've done that, you have two choices:
A) You can use the "car" wiring built in to the docking cage and supply 12 volts to it using the Empeg power supply.
B) You can use the "gaps" in the docking cage to connect your home wiring, and ignore the car wiring altogether.
Method "A" provides the easiest connections and doesn't require any funny fiddling with the wiring. However, the player will "always think it is in the car", and won't know the difference between home and car. Also, there is no ethernet connection on the car docking cage.
Method "B" requires you to fiddle with the wiring, perhaps even creating your own custom mountings for docking the home wires. Others have done this, even going so far as to make a docked ethernet connector. But it's not easy. It does have the advantage of allowing the player to know the difference between home and car, and its volume, EQ curves, loudness, etc. will change when you move it between the two environments.
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Tony Fabris