Dual computers - only one "office chair / monitor setup"

Due to neck pains I've been unable to solve in any other way I've just ordered a "Zero-g workstation" from Levus. While waiting for it to be delivered, I've started looking into everything else I need to sort out as well.

Up until now, I've had two different work desks for my remote working setup. One for the client (I'm a contractor), and one for the company where I'm employed as well as my own personal use.

With the Zero-G workstation, I'll now need to use it for everything for it to be of any use. This is what I've identified so far:

1. Deskhop for keyboard/mouse. These I already use in various setups (see Github for the project) and they're absolutely awesome. Since they're completely done in hardware with no drivers, there's nothing I need to install nor any risk for leaks of information between client and non-client systems. Additionally, they support whatever keyboard/mouse setup you have.
2. Switching input to the monitors without having to physically reach out and navigate monitor buttons. The DDC protocol seems to solve this, I've just made some initial tests and think I'll manage to work with this.
3. Webcam. This I haven't solved yet. A naïve solution is of course to just buy another one. For work I've previously used the one in the client supplied laptop, but in the new setup there's no way that angle will work.
4. Speakers. Not worried about this, client sound can probably come through the laptop they supply as before.

What am I missing, and does anyone have any other solutions to the issues above I haven't thought about? The total amount of monitors will be four, where two will be switchable between client and non-client work.

Note: Due to the nature of my work (cybersec) the systems need to be completely separate. I don't even run the client laptop on the same VLAN as anything else.