I run Virtual Machines from USB 3.0 Drives and have no problems attaching other USB devices to the running Virtual Machines however it may be the hardware I'm using so YMMV. One thing you can try it to use a USB 2.0 Hub between the USB 3.0 Port and the target USB Device. Obviously if the target USB Device is 3.0 the full throughput will not be available. Although as a workaround to utilize more then one device in your use case scenario it's all I have at the moment.
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