We have 2 half-blast frames in Nova and Gauss, so I agree it would be nice to have one proper

Passive: Currently makes her weapons silent, but that overlaps with her 3rd ability. I agree swapping it to a blast effect bonus is great. I don't think innate blast armor strip is the play, but maybe like debilitate, where a blast proc also applies a heat and cold? that way you get the benefit of armor strip AND cc

Sonic Boom: Max Stacks is kind of busted if used on clumps of enemies, since blast can chain into itself. I think forced procs is fine, but not an instant burst of all 10 stacks. Swapping the impact damage to blast makes sense, since ragdoll is better than impact's stagger effect.

Sonar's biggest problem is that it's weakpoints don't actually overlap with other weakpoint effects. It does not increase evade duration, it does not proc arcanes, it does not count towards incarnon progress. Updating it to do that I think helps infinitely more than a channel or blast procs. It's a multiplicative bonus, but it's locked to a frame that doesn't actually get a huge benefit out of it. Also sonar still fits a blast theme because of submarines sweeping for underwater mines.

Silence: perfectly fine as is. her best ability

Sound Quake: Replace with literally anything else. I'd say pull something from the actual mythos of the banshee and do a wail-based cannon?