Not what you’re looking for, but I have an old Lynx TWO-B PCI card. It has two inputs and six outs, so 5.1 surround. I only use one set of speakers so L/R is the same channels in stereo and 5.1. The card also has AES out so that feeds my Grace headphone amp.
As for “durability”: I can’t even remember when I bought this card. I mean, it’s got to have been around 2004 or something. Still works. Low latency. Clean sound. And I’m happy I’m on a Windows machine since getting PCI slots is still not a huge issue. One of the best investments in tech I’ve ever done.
Can’t answer for other interfaces though. I would think you could get one that would either work with the computer on and would route easily using the included mixing software, or even do it with the computer off.