Or, just put the new/smaller BT breakout module inside the empeg, so that it doesn't need I2S connections on the tuner wires. Will still have to do something similar for the serial connection though, either MOSFETs or diodes to prevent the same issues on those wires.
No you wouldn't, you'd just disconnect the tuner RX/TX wires from the interior plug on the empeg and problem solved.
We can add circuitry inside the empeg to tristate the I2S outputs when Bluetooth is not connected. (...) It can be software controlled
That wouldn't help, the bluetooth doesn't connect instantly when you dock it, and software wouldn't run instantly at bootup. you'd fry stuff before things got connected or software got running.
Or perhaps something more passive might work, such as diodes to prevent reverse current on those pins.
Not sure about the directionality of the current in each case: Empeg connected to tuner module, we don't want to damage the empeg or the tuner module, but then when the same plug is connected to the bluetooth interface box then we need the current to flow to the interface box.
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