Called function is not known at compile time and can have unpredictable performance

Hello! I am trying to schedule a MIDI event from a render callback and I would like to use @_noLocks. I understand that it can't work out of the box, but I thought _unsafePerformance would help, but it doesn't seem so.

Am I missing something? Here is a simplified code snippet:

@_noLocks
func test(schedule: AUScheduleMIDIEventBlock) {
    var x: UInt8 = 0
    _unsafePerformance {
        schedule(0, 0, 3, &x)
    }
}
func callTest() {
    let sampler = AVAudioUnitSampler()
    test(schedule: sampler.auAudioUnit.scheduleMIDIEventBlock!) ❌ // Called function is not known at compile time and can have unpredictable performance
}