Through splitting up Iron resolve (should have mentioned that at the time)
Though I'm not sure about this, it seems quite restrictive as it forces you to spend one of your feats on a latent ability, but giving you both at once seems too good.
How about, the first time (level 5) requires the latent, but the second time (level 9) it doesn't?
Yes to all! (though if you want to take this at level 6 that means you may need to change your feats).
You can be wherever you want to be, just make sure it's mentioned in your post obviously.