Wild shape subclass

Hi all!

First of all, thanks on advance to everyone :)

One of my player's patron is a demon that can transform into a wolf, a raven and a mist (it's a mix between a fiend and a vampire) and I was thinking about adjusting the archery subclass to include the wolf and raven form.

My first idea was adding two new invocations, one that allows the wolf transformation and another one for the raven (the raven one requieres lvl 9 and the wolf invocation as a prerequisite). This way the player gets the archfey subclass and use his invocations to get the new forms.

For the transformation I would use the wild shape rules from the druid but restricted to this new fixed forms.

Do you think this would be balanced? I also thought of replacing the Steps of the fey from the subclass with the wolf wild shape, but the mist already fits the subclass so I wanted to keep that as it is.

Thanks for the help in advance again :)