Not aware of this exact functionality as such (i.e. link to a third party ELM327), but there are plenty of HUDs that would plug into OBD port (as their only source of power and info) and supply all the same data (or, most of it), you get from a bluetooth dongle.David,
you're in the know about these HUD thingies.
Is it possible to get something that can sit on the dash, project an image and link to an OBD2 bluetooth dongle without requiring a smartphone as a link or bridge, do you know?
I'll have a look and get back to you on specific models, etc.