Once you get into replacing the head unit and add the second amp you regain control of everything. You will bypass the factory amp and just RCA out to the new aftermarket amps. Canbus will not matter at all at that point. If you need to save some cash at first, just get a decent high power head unit and power the fronts and soundbar speakers with it, RCA out to your sub amp. Pioneer makes a model, something like AVH8500?? That has a detachable face, high power, plenty of eq and crossover controls that would do well for your needs.
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