I use Dimension3D's ContentMirror to make vehicles right hand drive, and it allows the morphs to be kept too. The only problem is that the texturing gets mirrored too, so can be a problem for dials and words on textures, etc, but you may be able to just flip the affected areas on the texture map.

Hopefully in the attached gif you can see that all of the morphs still work on the mirrored jeep. The non animated jeep is the original, the animated one via ContentMirror.

 

Cross-post ! :)