The province % on the screen still can be wrong because of war goals and CB differences. There should be something in the ledger that does not simply have all the countries listed, but something like a drop down menu where you pick the country, CB, and War Goal (if applicable) and it creates what would be the the peace deal screen if things were 100% occupied. This way you can check other options and AE as well.
And please, please, please, remove building from WS calculation. It gets ridiculous endgame and is just one more thing that makes Europe hard to get into for outside countries. Every coastal province shouldn't be 40+ WS.
Edit: Pippin's solution would be the best in conjunction with the OP if we're going for streamlining.