Have you checked どんな時どう使う 日本語表現文型辞典? I don't know sure what nuances are listed at the bottom of the description in Kanzen Master N1 so I can't say for sure if it's what you're looking for, but it has a lot of N1 grammar (and everything before) but it's been pretty good in my experience for everything I've looked up. べく and んがため（に） are both in there, too.
