Yes, I was probably hoping a bit much of the technology. That said, converting an audio signal so it can be carried over a LAN doesn't sound too much to ask, but, I suspect there's not the need for the product or the ability to do it particularly well.
It gets used a lot in PA systems. Dante is one of the beat. There are quite a few proprietary systems. I have one from Allen & Heath. There's also Waves or Motu. It's all way beyond your needs and I would suspect budget.
Yes, I was probably hoping a bit much of the technology. That said, converting an audio signal so it can be carried over a LAN doesn't sound too much to ask, but, I suspect there's not the need for the product or the ability to do it particularly well.