Depending upon where you live, the RSPCA Wildlife Hospitals are often on the lookout for semi-protected habitats for not-quite-fully-fit hedgehogs e.g. three legs, one-eyed... and the like. Also, local Wildlife Sanctuaries often need similar habitats for their own rehabilitated (but not 100%) hedgehogs.
I think they like to have a chat with you, and come out and see the proposed release site to see how it measures up...
Give them a ring?