I wrote small tool on Google Go programming language. Its tool looking in Tanuka Corpus list of sentences(over 150k items) for those which contains only your WK vocab items and kana symbols.
HOW TO USE
0. Download and unzip archive.
1. Run executable file(Sentencegator.exe), and Sentencegator binds on 80 port of your machine.
2. Open in your browser
3. Use web interface
NOTE: If firewall or any security program asks your permission, accept it
B-line is some additional information about sentence(A-line).
Example sentence with B-line:
Also, since version 2.0 Sentencegator contains KanjiStats module.
KanjiStats useful if you want to know how many kanji you need to learn for reading your favorite ranobe or something else.
You choose japanese text file on your local machine(only utf8 encoding supports), and see full statistics about this.
See your API Key: http://www.wanikani.com/account