There's an issue that needs to be addressed with treasure card trades. There are...a number of cards, that are drops from various things that are needed for crafting that aren't available for auction or trade. Among these the Extraordinary card. Which I need for a crafting project. Which I have something near 15 on just one wizard....but not the wizard I'm using to craft for my lowers. I humbly suggest that even if you don't make these tc cards...extraordinary among them...auctionable...they would you please, for petes sake. Make them trade able between friends? So that I can do what I do with other cards I need for crafting and trade them to a friend to hold, grab the character I'm crafting with and get the cards back? Is that asking too much?
The wiki says you can garden for them too. Maybe try to garden for them while you wait for your update. Also, Idk how far behind your crafting is on that character that has all the cards, but maybe try to get him up too.