How to edit an existing IQ file.

I used a third-party watch face tool to generate an IQ file, but it's based on the screen resolution and each size needs to generate a separate IQ file. How do I merge multiple IQ files into one file? I've tried unzipping and then merging the file contents, and then editing the manifest.xml.Then modify the suffix to iq again, However, it is not possible to upload Connect IQ  is there any correct process?