Well I ended up getting a HiFime Sabre 9018 USB DAC. It's adaptive, though apparently this is supposed to work just fine on the Raspberry Pi.
I haven't purchased any kind of USB isolator yet, will test it out without one first to see if I need it.
I didn't find the right solution from the Internet.
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Hi, the DAC works with raspberry pi (depends on distribution). Make sure to use a strong enough power supply for the PI.The isolator isn't mandatory but might improve sound quality depending on your specific situation.