I came up with a Forged in the Dark hack for my FF2k19 game jam submission, but I realized pretty early on that I wanted to streamline the mechanics of the system—partially for ease of play (to make the game easier for one shots/making it extremely low prep on the GM side), but part of that was also because I was on a time crunch and didn't want to overextend myself at the time.
The biggest leap for me, mechanically, was changing the success metrics—instead of 1-3/4-5/6/crits, I gave players a pool of dice in every stat, and made success based on the number of matching dice you get. It skews the probability way different from your typical FitD game, which I find kind of a fun challenge.
(I also changed it because I have a friend who rolled snake eyes all the time during our Scum and Villainy sessions, so that was kind of a nod to him and to those players who consistently roll poorly)