Two files, one with added extension.

Hi,
Im using Sabnzbd+ with Sickbeard and mp4tools for automatically muxing the file into .mv4
Sickbeard puts in my series folder, which activates mp4tools to mux it into .mv4
Now my question.
I would like Hazel to delete the downloaded *.mkv after m4tools processed it and added a new file *.mkv.mv4
I cant really find an answer to this 'problem'.
Can someone please help me? ive tried applescript with shell commands, but since this app should be so powerfull, maybe this is the solution.
Thanks!
Im using Sabnzbd+ with Sickbeard and mp4tools for automatically muxing the file into .mv4
Sickbeard puts in my series folder, which activates mp4tools to mux it into .mv4
Now my question.
I would like Hazel to delete the downloaded *.mkv after m4tools processed it and added a new file *.mkv.mv4
I cant really find an answer to this 'problem'.
Can someone please help me? ive tried applescript with shell commands, but since this app should be so powerfull, maybe this is the solution.
Thanks!