You're on a roll with the cats, hmm?
Not much insight on that one, but I can tell you that both of my girls spent the first 3 years of their lives as wild cats - one as a stray in an apartment complex who took to sleeping on my porch, and the other was born "feral" in a cat colony by a trailer park. The second one actually adapted much quicker even though she wasn't around human company for any reason until I saw her photo online and inquired about her. She even has the clipped ear mark of a TNR cat. It probably depends on the cat's individual personality.
Edit - the second one I got was sponsored by a rescue organization who advertised her on petfinder but let her stay in her original habitat until someone saw her and wanted her, so that might be an option besides putting the one you found in a shelter and possibly ending up with the "unadoptable" label.