How would you integrate Amazon Alexa hardware into a car without software integration?

To integrate Amazon Alexa hardware into a car without software integration, the primary approach would be through a standalone, portable device. This could be a dedicated Alexa-enabled device (like an Echo Auto or a similar product) that connects to the car's power source (e.g., 12V adapter) and uses the user's smartphone for cellular data and Bluetooth connectivity for audio output through the car's speakers. The focus would be on leveraging existing car audio systems via Bluetooth or auxiliary input, and relying on the user's mobile device for internet access and app functionality, effectively treating the car as a passive audio environment for the Alexa device.