You could move the gimmick to another fire wallet, depending on what it is.
I have a kaps fire wallet, and I am thinking about switching the gimmick over because I like the Zipper in my kaps for Card to wallet.
When I got my fire wallet 2.0 my gimmick was installed incorrectly (it was rotated 180 degrees, so the top was actually on the bottom). It was fairly simple to pull out the gimmick and rotate it to the way it should have been. (i put almost no effort in doing so, poorly glued)
If you take the gimmick and remove the gimmick from, lets say kaps fire wallet. get the proper glue (something strong because the spring mechanism from fire wallet 2.0) and glue it on, in theory it will work just the same.
I say in their because I have not moved the gimmick out yet.
Hope that helps.