Tapping into the factory aux and USB should be easy enough for any decent shop, I know my installer could. This assumes your headunit has those inputs.
As for your external volume, I'm not sure about that... you're talking about a remote gain control, I assume? Most of those you can just set it at a level and forget it, and if it is run off a dedicated output from your headunit, lots of them will allow you to adjust them through the headunit's menu, or just leave it set at a certain level all the time, if you prefer.
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