Separate grammar checkers for different languages possible?

I’ve recently purchased Duden Korrektor, which obviously corrects only German. However, I would also need an English grammar checker, but neither LanguageTool or After the Deadline work with Duden K. Is it even possible to use separate grammar checkers for different languages?

That works for me with LO, LanguageTool 1.9, and Duden Korrektor 5.0 (on WinXP).

You can select a separate grammar checker for each language via menu

Tools → Options → Language Settings → Writing Aids → Available language modules

(enable all required grammar checkers)

→ Edit...

(select a single grammar checker for each language).

thank you!