Una, I am sorry you are struggling with this now and I so identify with this kind of wardrobe angst. It is all the more frustrating because you have been at this some time and (quite reasonably) feel it should be easier by now! Sometimes I wonder if it ever gets easier.
Anyway, you're further along this style-defining journey than I am, but something Steph said to me might have some relevance to you in this current dilemma. Back in the fall when I was muttering about wanting to look like an "artistic professional" or something of the sort, she suggested to me that one way to capture the essence of what I was after might be to build a backbone of classic pieces (e.g. the Halogen skirt) and in each outfit, ensure I also included Imogen's "third piece" (the starring player) in a more dramatic or attention grabbing style...more of a "statement" piece.
Well, in some ways UW professional princesses and "artistic professionals" are sisters. I know that basics tend to bore you. And you really don't feel like yourself when you are wearing them. And yet...you are a lawyer and can't scare your clients away. So maybe if you focus, for the work capsules, on keeping most of the outfit "professional" and making one or two pieces UWP. And in terms of shopping, maybe for the first while it would make sense simply to narrow down WHICH pieces would be your UWP pieces. Eventually, you would probably switch this up; but for the first outfit or two, it might be jackets (as those provide structure and the most visible bang for the buck, so to speak, but can also be removed if you encounter a really timid client) and/or footwear.
Now, I know you already own lots of great UWP jackets and footwear. What else do you need to make those outfits work? THOSE are the pieces to buy. And just create a couple of outfits for this capsule. If you don't see the same people every day, you don't need to wear a different outfit every day. At least at first.
Later on you might switch out the jacket for the great pants (as Jonesy suggests...but if pants are tough for you to find, you need something in the meantime).
Also, I have been learning a lot from Shannon's "rubric" approach. She thinks in terms of one thing from each of her key categories—Structure, Rugged, Urban, Retro or Vintage (I might not have her categories exactly correct).