OP you might want to look at lab grade bedding. It typically is blown and is not very dusty as it needs to meet very high standards. it costs more as well. Nepco makes an aspen,pine,and a paper bedding (it is dusty). Harlan also makes pine, aspen beddings, as does native earth. I am sure there are others but I have not used them nor researched more these are the ones I know of.

Kiln dried pine is best pine that is raw often has bark and is sticky, it is stupid messy as the chips glue to everything they touch and you cannot get the sap off with out harsh solvents. It is completely not acceptable due to the potential risks involved.

Papers are fine but IMO paper towel especially domestic paper towels (blue shop towels I am on the fence with) are the only substrate that have, with no doubt, killed snakes. I see no advantage that over comes the risk associated with them to make the small risk worth it. The big breeders I know won't touch the stuff. Too expensive for a large collection coco coir at least in my area is impossible to beat for cost, if you can store a bail of it.