Well, you can enable the analysis with added relevance to a single computer or computer group, so it doesn’t automatically target everything; respectively increase the frequency of the reevaluations to let’s say 30 days (depends how old your data is though - if it is 2 weeks old and you set frequency of 30 days, even if you enable it won’t update it right away) BUT you are absolutely right, it’s not ideal…
It’s been a long time since I looked up the options of the Audit Trail (set it once years ago and never needed to touch it again) but if not mistaken should be "Remove data older than days: " value - if you have it set to 30, any data that is older than 30 days will get purged and since as you pointed this data is not getting updated will be “in scope”. Be careful though - similarly to the analysis approach, it’s setting that controls “everything”, so if you need to keep data for compliance purposes for certain period but need to delete faster for this just one property, it may not be good to drop the value as it will delete all data that is older than the threshold…