Getting rid of them permanently is one thing, getting them out of sight is another. If you slide you emoji listings to the left, those "super-emojis" will vanish from view, and your usual set will appear each and every time thereafter. At least for me, the emojis seem to remember from where I selected for the next use.
On a Mac since 1984.
Currently: 27" iMacs, Macbook Air, macOS 10.14.x,; iPhones, iPods and iPads galore!