It is apparently possible to switch from your first playthrough (where you unlock Survivor difficulty) directly to a Survivor+ playthrough via a glitch with Chapter Select. Does completing a "Survivor+" run in this way count for trophy completion?
The glitch is where you start a new game+, play through to "20 Years Later", and then start a new game via the chapter-select and pick Hometown on Survivor+ difficulty.
This only works if you delete the patches from your system, but they can apparently be re-downloaded once you've saved on Survivor+ mode.