Dkali's active is useless for Fenrir, so she'd be useful only for her fingers, sbr, and an unreliable bind clear. With all the stuff you have to match, heart row bind clearers aren't something you want to mess with. So no. Another Jorm would be better, assuming Ama is awoken so you still get 100% sbr. Gainaut's cooldown is way better, but without a heartbreaker you really have to work to match his board perfectly to get enough damage unless you fix it with Fenrir.