Any material that is still radioactive after a hundred years wasn’t that deadly to begin with. There is a strong link between ”hotness” and short half-lifes, fast-decaying extra spicy isotopes are..fast-decaying

Actually, those materials can be MUCH more radioactive in the beginning compared to 'conventional' nuclear waste, the half-life is just so short that you can let them sit for a couple of decades and then deal with it.