Potentially yes, but equally portentially no.Wouldn't these inserts just give a knock on effect somewhere else ? Like more stress on linkage , drive shafts , bearings etc unless you polybushed everything ?
The drive shafts linkage etc, will be created to work with the engine being in the right place. As the engine mount starts to have more play in it, it will have a bigger impact on the other parts, moving them more. By having the better engine mounts you will likely reduce the wear and tear on other parts caused by a slowly deteriorating engine mount.