Override Manifest values in v10

[ComplX1]

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We're using the v10 version of the package, and are looking to disable "enablePreview", But with the manifest being in code now instead of inside a package.manifest I'm struggling to find a way to override the settings.

I've tried adding a package.manifest in the appplugins folder hoping that that would take priority over the one defined in DocTypeGridEditorManifestFilter.cs

I have tried creating my own ManifestFilter, finding the one built by this package and overriding the properties, but to no luck.

Any assistance, or Docs on Extending/Replacing manifest values?

Many thanks