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I think that could depend on how complex the GPs are for instance, are they applied only to OUs or are there filters based on Groups (users or computers) which would have SIDs applied, etc. and then the nature of the GPs (referencing UNC paths, etc.)

I done this as well and it depends on what all you bring over that is specific to another domain. But if you were to do it and replace the items that are domain specific it will be fine.

done it all the time. Make sure to use migtable.migtable

ditto on what others are saying, never used migtable tho, looks shnazzy.

the group policy migration table looks at the settings in the GPO any anything domain specific such as unc paths it allows you to correct