Hi Chris,
My guess is that you want an all in one part but not being aware of one, can you integrate the (bearing) hub and these:
I’ve made custom dials/controls similar to what you are asking with off the shelf magnets (you could use ball-nose spring plungers as well). With both you can have friction/drag between the 180 degree points that it ‘locks’ into. Playing with the magnet strength you can play with how easy it is to release.
Hope this is helpful.
-Peter