On the N20 engine there is no common and/or corporate advice...people have gone well past 100k miles on the N20 without issues..
The previous generation E85 started to lose their water pumps at the 70k ish miles onwards...
I’ve pondered the same issue but haven’t reached a conclusion, I probably, since my car is a long term keeper, preemptively purchase a replacement from autodoc next time they have a deep discount offer..
Then at least it will be a short notice and then cheaper swap out..