Getting a time limited Nodestone on a character that isn't 5th job yet is basically a slap in the face.
Stop making them time limited.
Allow them to be used before 5th job. (Just store the number somewhere and activate them when they become relevant.)
Give something else.
Allow me to convert them into non-time limited Spell Traces or something like that so they aren't a waste.
You can't even trade them within account, so you may as well just throw them away immediately if you get them on a character that isn't ready for them. Making them tradeable within account would be a small improvement, but if you don't have any 5th job characters yet? See the first line of this post.