That's the thing. Tech keeps advancing and nothing is more advanced than my current phone.Why not just get a new head unit? Tech has advanced a lot since 2017 when this thread was last updated and Carplay/Android/BT head units have become more affordable.
All I want is a HU with a volume knob and BT, but they don't make those and extra gear is req'd to retain the steering wheel controls and chimes.
Tapping into existing wires is the best choice and will give me exactly what I'm looking for.