- KVMs usually are expensive and terrible; switch at the destination instead. For example, Dell's UP2716D has 4 inputs (2 HDMI, 2 DP). Dell's other professional grade monitors have similar numbers of inputs. The downside is that switching inputs is mildly awkward using the monitor controls but the inconvenience is relatively minor.
- As for wireless audio, physically wire up your audio sources to a 3.5mm audio switch or even a tiny mixer (search for "mini audio mixer" on Amazon) and connect it to a Bluetooth transmitter. Pair your headphones with the transmitter.
If you use the monitor for switching video sources and can configure your machines to output audio over HDMI/DP, then the BT transmitter can be connected directly to the monitor's soundbar output, saving you some wiring.
- That leaves you with needing to switch your USB devices but switch boxes for USB are plentiful and cheap.