Making a hotbar like that is probably not possible, since I know hotbars are stored server-side.
Making a hotbar with additional buttons is certainly possible, and there are ways to edit them in game, I believe. I think there's a couple mods that already do that. But for sure you can make some buttons, but...
Every hotbar will have those additional buttons (so you'll have to tie them to the frame or something, so that you can hide them when you don't want them) and there's no way to make them act like a true hotbar w/ the cooldown and such.
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