The geocaching.com site/API has recently appeared to stabilize around the Corrected Coordinates data field and supporting corrected coordinates across cache types.
Some apps and some sites such as PGC have supported specifying corrected coordinates in the personal cache note. It might be nice now to update the formal GC Corrected Coordinates data field for those caches.
Please consider an option via a VGPS to update corrected coordinates for the caches that contain them. I suggest a flow such as https://project-gc.com/Profile/SolvedMysteries?hidefound=on&hideowned=on&hidearchived=on&submit=Filter
to find all a users solved caches which are not yet found, owned or disabled. They can be added to a new VGPS (all or as many as the user wants), and then on the https://project-gc.com/User/VirtualGPS
page and under the Export drop-down, have an option to Update Geocaching.com Corrected Coordinate.
Does that seem like a useful feature for PGC users?