This runs quite literally counter to the entire premise of Treasure Knives and unfortunately is a pretty hard no. This lets people buy only what they want, spending less money overall, wastes the hard work put in to all of the rest of the collectibles we make that people decide they don't want. Were we to even consider doing this, the markup would need to be probably astronomical.
We included the dust system so that you have a better chance of obtaining more rare collectibles that aren't dupes, but as a business, it's important that this works the way it does in order for us to be able to spend on Loka for the future.
We are not Blizzard, nor Overwatch.