I remember reading a scriptural "explanation" of purgatory in the last 2 years....can't quite remember where. Scott Hahn perhaps.
I think it only works if the Apocrypha is used. Beyond that "outer darkness" is distinguished from the "lake of fire."
It's the eventual acceptance piece that is missing in the real canon.
There's also the verse about those who say evil things about Jesus being forgiven versus those who blaspheme the HS never being forgiven.
It's hard to imagine that being twisted into a defense of purgatory, but it is.