I suppose since I'd been hearing that the Loxjie A30 uses an inferior DAC for the USB input I was trying to avoid it and stick with the optical wherever possible.
Loxjie A30 Amplifier Review
This is a review and detailed measurements of the multifunction Loxjie A30 power (speaker and headphone) amplifier with integrated USB DAC and Bluetooth input. It was kindly sent to me by a member and costs US $159 plus $7 shipping on Amazon. The A30 sports a high resolution and high contrast...
www.audiosciencereview.com
Amir measured it, looks like it's at least half decent... anything 80dB SINAD or higher and it's quite hard to hear anything wrong. By "quite hard" I mean in most situations most people couldn't tell the difference if their lives depended on it.
@Steve Dallas has the right idea, mess with the laptop standalone while you wait for the TOSLINK input to arrive.