I`ve done it several times. Dry`n with a raincoat,(incase of rain) not wrapped up. Mold wont set in in three to six days. not even mildew.
Not everyone has ideal conditions. I`ve too many neighbors to dry at home, but storage isn`t a problem. He said he needs to do it outdoors !i
I live in New England , understand your wet season, we get them too, never had mildew or mold conditions. (I expected and got rain) If you`re worried, build a lean shelter hang them in there. But if you must dry outdoors, rain is not good !i
I was thinking evergreen tree and a 50 length of para-cord. Tie a stone on one end throw it up in the tree and tie the other end to the stalk and hoist is way up in the tree.