inputexec VS synergy

I recently put something together similar to this, to switch between my personal PopOS/Windows machine and my work Macbook Pro.

I used one of these manual USB switchers, (https://sabrent.com/products/usb-sw30), and connected it's switch to a Raspberry Pi 4B via GPIO (4B is overkill by wanted hardwired network). There's a small separate keyboard (which will later be a macro keypad of some sort), connected to the Pi. Using inputexec (https://github.com/rbarrois/inputexec) to detect keypresses and then firing off a specific script to send a network request to the LG TV I use as a monitor to switch the source, and then set the GPIO connected to the USB switcher to high or low to switch the keyboard/mouse to the other machine.

I can also turn on/off the TV using the same WebOS API (and Wake-on-lan) as used during the source switch. A Kasa smart outlet also gets toggled to turn on/off a BenQ ScreenBar Halo (https://www.benq.com/en-us/lighting/monitor-light.html).

So with 4 different keypresses, I can switch to Work, to Personal, turn off monitor and light, and turn on monitor and light.

No one has mentioned ShareMouse yet? (https://www.sharemouse.com/) In my experience it has worked way better than Synergy. I switched after getting fed up with the synergy developers not responding to various multi-year old bugs that made the software unworkable for me (e.g. https://github.com/symless/synergy-core/issues/5992).

The only downside is that you have to "renew maintenance" to continue receiving updates to ShareMouse after a year. But I haven't done that yet and it still works fine for me.

I want to be able to do things like Synergy, Steam Link, Unified Remote, and Media Servers between any of these devices, with as little added latency as possible (especially important for steam link)

i've got several fedora linux machines running and sharing their monitors via synergy (https://symless.com/synergy) , all controlled by the keyboard/mouse on the primary synergy server.

Not sure if this is what you're asking, but I've been using Synergy Pro (Windows, macOS, Linux) for years, and it works seamlessly. It lets you share your mouse and keyboard across multiple systems (with or w/o encryption), copy and paste between computers, etc.

I've got an M2 MacBook Air

Per the Advanced... screen under Displays in System Settings, you can link to a Mac or iPad to control it a la Synergy[0]

I have not done it myself, but I do not see why you could not do it with a current-gen Mac Mini

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[0] https://symless.com/synergy

I previously used a software solution to do the same thing and it was actually really good, better even. It might have been this software but I have to check to be sure - https://symless.com/synergy - as I’m not at my laptop right now.