What system would you propose?
Several of us post lists of available manga here (I generally post here monthly, even when I don't add new items), and I have WishList manga posted in the WishList Multiples topic in the Book Bazaar.
Also, you could try posting your non-WishListed Wanted Manga list here to see if anyone can offer you multiple books. (I also have a lot of manga wanted, but my list is so long, it isn't really feasible to post my Wanted items here.)
I'm sending a PM to you about another Manga swapping site (specializes in manga-related books and items only).
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