Looks like the STWF feat pre-reqs are 15 BAB and 19 dex. In order to take this as a rogue, I would need to be able to take a feat at level 20, which means sticking a level of fighter or monk on as my last level. This will mean not having maximum ranks in skills, and it will also mean not being able to take a capstone.

Is there any other way to implement STWF to make it so that 3/4 BAB classes can take this and still be pure?