Maybe not what you are looking for, but anyway check out the Zoom L12 or the "big brother" , L20. They are digital USB Live mixers, audio interface(14/4, 22/4) plus record to SD and 5 independent zero latency monitor mixes. And they works great with Linux.
Mixbus Pro 10.0, Kubuntu Linux 64 23.10, Stock Low latency kernel, KXstudio repos, i7-3720QM CPU@2.60GHz, 12 Gb RAM, nvidia GeForce GT 650M/PCIe/SSE2, X.org nouveau driver, Zoom L12 Digital mixer/Audio interface