Try to use AD5254 board

[SuperNinja]

I think Arduino or better : ESP8266 board based is better than RPI for this sensors.

How can I integrate a AD5254 bord

did you know Arduino ? if Yes try this GitHub - pganssle/AD525x: Library for I2C communication with AD5253 and AD5254 digital potentiometers using an Arduino. to begin to use your board with ARduino , and after you could comeback us to use it with Cayenne.

Begin with this : Getting Started with ESP8266 using Cayenne's MQTT and comeback to show us what you did.