You are talking about units that , for all purposes are antiques....and never designed to work together, even when they were new.
As is always the case, if you have several hundred hours of time to waste, you MAY be able to cobble together a crappy system that MAY work half as well as a current system that costs half the amount...that is, until you drive over your first speed bump, and all hell breaks loose.
I doubt that anyone here has the time to waste on this obscure project.
A quick Googling suggests that attempting to add periferals that were made this century to the cva1000r have met with severe dissapointment.
Come on guy...you just bought a BMW...why cheap out on the AV system ???!!!