is there now a low latency solution for windows 2nd monitor? I was only aware of some software where latency is quite bad or one company that provided a wireless HDMI / Displayport dongle...

Also the nice thing for headphones within apple is, that the airpods automatically switch to where the attention is... meaning e.g., in case I watch something on the laptop and pick up an iphone call (no matter if via phone or any app) the airpod automatically switches