I have an inkling that the following word usage is grammatically-correct; however, it is immensely difficult to search for confirmation, as all I receive for queries like "Proper as an adjective" are reams of results on "Proper adjectives". The word itself I am using as a postpositive adjective, similar in form to the phrase "time immemorial".
The shelter remains in name only; the shelter proper is in another town.
Work in theory remained, although operations proper had mostly been outsourced.
Can anyone advise?