They look great! I have some 3d printed nipple clamps from TerribleToyshop at Etsy that are amazing (cruel), might be worth checking out for...
I just went with padlock with hex screw. Seems to be the best of all options imo. Can get a hard(er) to pick padlock, or use seal since it has...
There are categories/filters? Let the poor guys live. (I don’t even have any pics). I find it informative to have a look at others’ “solutions”...
When in January did you order if I may ask? (ordered 7th Feb)