I think we should provide similar "reroll" functionality for ALL Wildercrate items. 

Currently the WilderForge only works on tools.

I just boutht 6 Wildercrate keys and received 3 of the same item (the Yardtick) which I already have.  Of the other 3 items, only 1 was an item I don't already own. I don't mind saying that I am feeling a little burned by the transaction and would not repeat the experience under the current setup. It's just not worth it.

It would be nice to be able to reroll those items in the same way...combine two to get a shot at getting something else.

This would be nice but as the keys cost money it the cost to reroll one should be like 10 diamond blocks and one item. As these have monitary value you would be losing lots of money as a player. The cost could be upped but i think it should only be one item lost.

If implemented, I would also think this should be based upon the type of item being re-rolled as well.

IE: Keep the wilderforge JUST for tools. Tools in, Tools out. Make a new interactive block (like a Wilder Bag of Holding) that works with JUST the Wilder Crate items. Crate item in, Crate item out. 

Wilder Bag of Holding can be renamed if needed.