Hi, I am based in the UK and have many years of electronics desing experience including automotive. I part own a company in electronics design and manufacture (www dot shakenelectronics dot com)
I believe we could come up with a design based on what I read from your project brief. Signing of an NDA will not be an issue, just let me know if you wish to discuss further. You can contact me through here or our email address is on the website.
Please ignore my bid price, if you can market this then we will take the hit on the prototype design and production.
We would need to discuss the business side but could work under some kind of percentage base / royalty or exclusive manufacturing contractor for the device.