Well, the shots of Pryde speaking to Palpatine are all static, so you theoretically could mask out Pryde and replace him with Hux, if you can find an appropriate shot of Hux just standing, like when Snoke’s hologram appears on the bridge in TLJ, before he slams Hux to the ground. You could create a close-up of Hux looking at the hologram as well, possibly. He doesn’t really have to say anything at all, Pryde only responds once in the entire scene. And then you could reuse shots of him on the bridge of his Star Destroyer (and possibly the Supremacy) to have him present at the battle of Exegol. It mostly would be a lot of masking him into certain shots, and color grading certain shots to have them match the surrounding shots.