Has anyone else got notes about a suitable way to configure this?

Eclipse has lots of options here, and I though that it was enough to
just block write access to the configuration subdir under the
installdir. That should trigger a fallback to per-userprofile settings.
It wasn't working for me though.

I have some notes, still testing a few things, but looks like it works.
Is there interest in this?

Essentially, it is more Eclipse specific, but I am happy to make a wiki
entry or cool solution if there is interest.