IIRC it's possible to temporarily unblock your credit reports if you want to apply for new credit. It's still a bit more hassle than if you didn't have them blocked at all but I think you should still be able to get instant approvals assuming your credit history in general is good.

(Disclaimer: I've never had to do this so I'm not 100% sure on the details. Maybe someone can confirm that I'm not completely wrong here?)