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Onkyo TX-RZ50 has full preouts. Note that Amir’s review gave this a bad review due to the power amp performance, meaning that your use-case entirely avoids the built in amp issues.
Would the X3500H be a suitable option? Reading Amir's review of that unit he was very damning of the DAC, with issues that are more prevalent at higher voltages (it's a bit over my head, so sorry if I'm mis-speaking!).