For VPI owners with 3D tonearm bases

I'm looking to trade out another tonearm with my current 3D so I can alternate cartridges on my Superscout.

When I upgraded to the 3D they had to give me a whole new base.

Is my only choice to get another 3D(seems like I'm trapped with a unipivot) or are there other tonearm options which will allow me to easily go back and forth between arms? They would as you know have to have the cable to go into that rear black box.

Thanks for any ideas.