Fairly sure our tech (more detail here: Parental control mechanisms - Heading off bad press - #66 by Warren) could be adapted not just to include a collective list for older users, which could be enabled to block off “undesirable” content en masse and then rolled back on a category basis for those who want to fine tune what is allowed through the SAFE network. That would all be from a centralised list accessed in realtime by a per user (or per LAN) app.
Be happy to explore that further if there’s interest.
Regards
Chris