TRRS might work for power, but it sucks for signal integrity - ergo no high-speed for you. And 4 wires is nowhere enough. You need two for each differential pai

TRRS might work for power, but it sucks for signal integrity - ergo no high-speed for you. And 4 wires is nowhere enough. You need two for each differential pair. No, half-duplex is absolutely not okay, it's the worst design decision in pre-SS USB.