Who came up with "nothing propinks like propinquity"?

It looks to me as though Ian Fleming is the first author to have used the expression, "Nothing propinks like propinquity." A Google Books search for propinks strikes out on anything older than 1956, as does a Library of Congress newspaper search for the word propinks across the period 1836–1922.

The online attributions to P.G. Wodehouse seem based on a conversation in Right Ho, Jeeves in which Jeeves suggests propinquity as the word Bertie Wooster is trying to think of, and Bertie confirms that it is. (The conversation appears on the Association of Independent Librarians page that Hot Licks links to in a comment above.) None of the online attributions of the quotation "Nothing propinks like propinquity" either to Wodehouse or to Dorothy Parker that a Google Books search turns up identify a page in the author's work where the expression appears. This is a warning sign (though not a definitive proof in the negative) of false attribution.

The only quotations involving propinquity that make their way into The Oxford Book of Quotations, third edition (1979) are from Shakespeare, King Lear:

Here I disclaim all my paternal care,/Propinquity and property of blood,/And as a stranger to my heart and me/Hold thee from this for ever.

and from Mrs. Humphrey Ward, Robert Elsmere (1888):

'Propinquity does it'—as Mrs. Thornburgh is always reminding us.

The quote from Robert Elsmere has much in common with "Nothing propinks..." as an idea, but I don't think that Ian Fleming owes her any royalties on the wording he devised.