Some Japanese shops offer a service to replace the main logic board with one from a non-JDM wreck. Cost: ~$500-$700 USD + shipping. You lose the Japanese TV tuner (no loss) but often lose the reverse camera compatibility.
Mount the external screen to your dashboard or windshield. Power it via the cigarette lighter, and run a 3.5mm auxiliary (AUX) cable from the tablet's audio out into the Panasonic Strada's AUX input. This gives you a flawless, English, voice-controlled navigation and communication interface while utilizing the Panasonic unit purely as an amplifier. Conclusion panasonic strada cn-hw850d japanese to english
Ensure you have the free Google Translate app installed on your iOS or Android device. Some Japanese shops offer a service to replace