Dwight,
Pretty sure you're SoL on this one. Android auto seems to *require* the apps to be written to work with it. I *believe* that the evolution of the Android API should make this a relatively easy affair but considering the 'resource challenged' nature of MLO dev in general, it might not be on top of the list. To wit, we haven't so much as heard about Android Wear support and I'd doubt Auto is higher on the prio list than Wear.
Unless there's some kind of an "app wrapper" for Auto that can wrap at least the widgets (and a quick G search didn't really turn up anything like that), not sure I'd hold out much hope.
Good luck and share anythign you find.