Reference to Polymorphic type?

I've used polymorphic relationship for a while, and the morph_type column stores many repeated string, and I'm afraid of if one day I need to refactor a model, then I might need to replace them from several tables.

That's say a simple morph relation(from laravel document)

posts
    id - integer
    name - string

users
    id - integer
    name - string

images
    id - integer
    url - string
    imageable_id - integer
    imageable_type - string

The imageable_type in images stores many 'App\Models\Blog\Post' and 'App\Models\Blog\User' strings.

The images table looks like this:

id|url    |imageable_id|imageable_type
1 |http://|1           |App\Models\Blog\User
2 |http://|1           |App\Models\Blog\Post
3 |http://|2           |App\Models\Blog\User
4 |http://|3           |App\Models\Blog\Post
5 |http://|5           |App\Models\Blog\User

---

What if create another imageable_types table as a imageable_type reference?

imageable_types
    id - integer
    type - string

The imageable_types table looks like:

id|type
1 |App\Models\Blog\User
2 |App\Models\Blog\Post

And images table will be like:

id|url    |imageable_id|imageable_type_id
1 |http://|1           |1
2 |http://|1           |2
3 |http://|2           |1
4 |http://|3           |2
5 |http://|5           |1

Does it better or worse?

If it is possible to do, how to modify model and not affecting the original code?

Like this:

$post = App\Models\Blog\Post::find(1);

$image = $post->image;

$image = App\Models\Blog\Image::find(1);

$imageable = $image->imageable;

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