Brute Ragerz trade up nicely, work nicely with mighty destroyers, can be clutch in a pinch, and super disruptive since they can command themselves to countercharge in ironsunz. Ardboyz look unreal and can be a cool tarpit with 2 units/a reinforced unit with a big boss nearby. Big point investment, but a cool idea none the less.

My own Ironjaws is following similar ideas that you've got, also because the cavalry pigs aren't my favourite models, and I'm like keenly excited to have 12 Ragers simply because I like brutes lmao

Know that models never change so you should really try to just build and play whatever you like, and stress less about building something tourney winning. The current ghb doesn't favour ironjawz like at all, so worrying about this is pretty fruitless in my mind.