I think Kirby could probably do it, and very well at that, provided she can do a convincing American accent. At least in the case of Ana de Armas, her accent is Cuban which would align with one of Selina's canonical backstories, I don't recall an instance where she was ever British.
However it'd be nice to see a more ethnically ambiguous iteration of Selina IMO, so names like Naomi Scott, Eiza Gonzalez, Vanessa Hudgens or Ana de Armas would all be really great. I especially like the idea of Naomi Scott in the role. She was a highlight in the 2017 Power Rangers film and it sounds like she steals the show as Princess Jasmine in the new Aladdin remake. I have a feeling she's about to breakout in a big way with this film, so it could be smart for DC to go for her.