I have contacted steam and currently waiting for an answer. It was never my goal to make them unusable.
I thought they would still be in your inventory and could be used after deleting them from the dev panel, since they are standalone and so forth couldn't been modificated which being the reason I made new ones.
Its kinda lame that they now sit in your inventory and cannot be used, I don't understand why it works that way...
Hopefully steam will contact me soon and solve the situation somehow..
Its also odd that I could do this without their approval, before I had to "Set for review" so a steam personel would check it out and push the accept button.