Probably easier to create a server side function instead, then.
But wouldn't you still have to go through all the planning steps within the function for any queries, although i'll admit i'm not familiar with Postgresql functions.
Server-side functions are compiled when installed. Since my function would only contain simple queries that are parameterized, it would pre-compile well.
While the function may be compiled, the overhead is the same for preparing the statement inside the function. So I don't think it's a huge win.