How about diatomaceous earth? Ultrasorb or something like that - can find at auto parts store...
I use it for some of my seed starting in spring; mix it up in garage and bring inside to sow and grow. It is a bit dusty, but I have gotten into the habit of wearing a dust mask when mixing up my tubs of potting mix.
Don't use the diatomaceous earth used as a feed supplement - it is powdered, i.e. ALL dust.
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