My view is that the improved unarmed attack feat is all I would require for this, or you can take improved shield bash but call it "glaswegian fighting style" (okay, bit of a Scottish joke that one), and of course just change the feat so that you use knees, head, elbow, finger gouges, etc.
What you are talking about is combining some aspects that would not normally be combined to add a lot of flavour to your character, and I am all for that.
So take this as my blessing to go ahead with your plan. Single feat only. Either take one as discussed, or create a new one that does the same thing.
AWESOME! And thanks hewligan. My next feat doesn't come up until 6th level so we've got a bit of time until we see this in play. If Jokad even survives...
5th - BARB 4/ RGR 1
6th - BARB 4/ RGR 2 (get 2 weapon fighting style, Feat: Imp. Unarmed strike)
Friadoc, glad you're feeling better.