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You might want to try making a PMD based morph INJection, as this method doesn't require empty channels to be present.

There are other ways round the problem, ISTR that there are scripts to add channels somewhere, which you'd need to run before the spawn script.
The drawback would be that the INJ files wouldn't for anybody else unless they also created the required channel(s).
It might also be necessary to tweak the spawn script to recognise the new empty channels if it's expecting them to be named according to the convention used by the DAZ figures.