I've missed having access to Handoff on the lock screen since it broke in iOS 10 (I think?). I really want Apple to bring it back and I think it'd be perfect to style it like a Siri Shortcut suggestion. Heck it could be tagged as a Siri Shortcut to make it seem like part of iOS' intelligence features. I made some mockups! It might be cooler with a better title and description but that might mean making some changes to the NSUserActivity.