Even though this is tedious, why not:
Complex kanji compositions are present in content heavy stories such as Akumetsu for example.
- Scan your manga onto your computer or likewise search for a Japanese raw available on the internet.
- Use Gimp, Photoshop or any editing software to remove the furigana.
- Save it as an independent folder and only reference back to the correct raw for quality checking.
- Profit?
Complex kanji compositions are present in content heavy stories such as Akumetsu for example.