Is there such a thing as craving for enlightenment and would it be unwholesome?
A strong craving (Taṇhā) for enlightenment would not get you there as it is unwholesome.

You need some desire or motivation (Chanda) to get to enlightenment. But when you get there this desire is also no more. Say you want to go to the park you need some desire to get there. When you are there you no longer have the desire to go there.

Craving for enlightenment would be unwholesome, the intention to achieve enlightenment would be wholesome.