You're better off with a custom action that takes prefits. I just switched off a Bergara barrel-nut setup cause I'd rather have shouldered prefits, among other reasons.
And sinking what it costs to get a base R700 action to what it "can" be costs just about what you'd pay for a custom, with better resale value on the latter.
OP, I'd advise you to stay away from the Howa. Cheaper to get into, but harder to move if you decide you want out, and much harder to support aftermarket. Stick with the R700 ecosphere, and I think an Origin with prefits is a strong choice.
Now, I'll caution you on that Bravo: it'll cost you more to mount an ARCA rail, which I expect you'll quickly want to do, so price that in when comparing chassis costs. Also bear in mind that most chassis don't require bottom metal, while most "stocks" do, and that adds anywhere from $100 to almost $300.