I think it's a fantastic idea. I said it before.
Also, if you want to invest additional time, this could be a perfect time to polish the game even more.
Jason released Deep Cuts, that give a new cut to many rules (I didn't try the Threat roll, the different Devil's Bargain etc., but the damages a-la Fate are nice, for example). So you could integrate some (or all) the new mechanics, if you think they could better serve your setting and mood.
Finally, you could think to simplify some part (in the meantime I saw FitD inspired games that have less skills, or that twisted the stress into "charge" (Charge SRD also on itch.io) etc. etc.
Am I running too much?
Viewing post in Adding "full game" pdf to A Fistful of Darkness soon comments
Hey Andrea! Great to hear from you. I saw Deep Cuts but I want to let it open for every group if they want to use the new rules or not. Easy applicable to aFoD, too, if you want to. I want to leave the game mainly as-is ... while working on a Companion for more world building material and play-modes. Having the book done gives me time again for that and other games.