First let me just say that if you miss the charge after ex.HB you can at least throw out a f.mp for a standing reset if you so choose. And again, I’m bad and not even a Urien main but I think st.mp is his best oki button in any situations where you’re able to land it meaty. P sure it’s his most plus non-charged normal, can go into cr.hp combos on counter-hit or throw/pressure on block, etc. Oh and every now and then if you’re feeling cheeky enough there are certain knockdown situations where you can side-switch (or not) with headbutts. Gimmicky at best usually but I’d recommend watching that Piano Densetsu vid @LiangHuBBB posted a couple pages back for some ideas.