The trick is: I can't cut-and-paste between the two machines. So there is never even a temptation to do so and I can guarantee that my writing or other professional output will never be polluted. Because like you I'm well aware of that poor impulse control factor and I figured the only way to really solve this is to make sure it can not happen.
The problem is that it's just much easier to un-quit and run the LLM in the same laptop you work on.
It's just so very tempting.
Oh, and LLMs are of course geared to pull you in further, they are on a continuous upsell salespitch. Drug pushers could learn a thing or two from them.
It wouldn't work in every use case (what if you need to include a verbatim quote and don't want to make typos by manually typing it?), but it'd be useful when everything in the document should be your words and you want to remove the temptation to use LLMs.
It really does sound like an addiction when you put it this way.