[NicknamedBob]

"I figured they could be part of the tale behind the germi(n)ating idea of the first person adventure featuring the Flying Castle."

I'm okay with that. But you'll need a way to rescue people from the influence of nanites. Otherwise, every scenario becomes a war of attrition.

What you want is an electronic pulse beam weapon, such as a Beeber-like device.

That immobilizes the nanites, and then a medical flush clears them out of the system.

Of course, if your soldier is killed, then that may not work. Unless you want to try to employ friendly zombies.

[Darksheare]

I figured the nanites could be coaxed out with some signal, but finding out the correct signal depends on finding the initiating Slaver and the code it generated.
Which means running the risk of being nanited yourself.
I also figured that it starts out with a hacker on Earth finding a way to hack the bots, ultimately leading to the Hab sending him an orbital surprise party as his reward.