I've always preferred separates.
But another answer that might work for you would be one of the converter sets with firewire daughter cards. Mytek and Lynx come to mind.
A less costly way might be to buy an older 8x96k converter set. The Mytek, for example, come as DAC or ADC, so you could buy just what you needed, and as they are older, probably get them at a good price. Then you'd still need something like an RME AIO, Babyface, RayDAT or some similar product from another vendor.
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