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> Making sysconfig look at sitecustomize seems like the wrong approach.
I mean, you're literally customizing the site, so having it be done from sitecustomize doesn't seem terribly wrong. But I agree, I'd rather see the code in sitecustomize poke paths into sysconfig, rather than the other way around.
The problem then would be that -S bypasses the path configuration entirely, which is likely going to point at non-existent paths. So yeah, for this case you need an override that isn't tied to the site module. Having a similar-but-different mechanism in sysconfig seems fine. I have a *slight* preference for non-executable code, mostly to avoid the risk of import hijacking, but it's only slight.