Can I ask how you were going to hookup the sensor the Spark core for your product before discovering this issue? Do you already have a PCB?
If you don’t already have a PCB, you will likely need one for a product–I can’t really imagine another way to make quality connections and have mechanical security of the parts. The Spark core does not have any mounting holes, for instance, so right there, you will need some other PCB carrier at least. In fact since the sensor needs to be out where it might get exposed to ESD, I would think you would want a series resistor and a capacitor protect the core inputs anyway.
If you have a PCB designed already and are worried about the rework, you can try it without the resistors, or add a zener diode for protection against over-voltage in the holes where you connect the sensor or on the back of the sensor connector, depending on how you connect. A 1N4728A 3.3V zener would would work well, just remember it gets connected “backwards” so that it is reverse biased and the cathode goes to the sensor input and the anode goes to ground.