Hello pYro, I am lazy! No I didn't do it yet, because I still haven't bought a soldering iron...
But, I'm almost sure it will work, because the guys who did the ArduCam use it to save a .bmp file from the display's GDDRAM (using a very similar display)
As for the Flash chip, I believe we need a SST25VF chip, especially the 16 Mbits version, SST25VF016B (also exist 32 and 64 Mbits versions of this chip, so in theory it could work too!), can be found on ebay for not much I would like to try, but I'm affraid I have no idea how to make it work, I can't really understand datasheets timings etc..
Edit: changed "MB" to "Mbits"..I have misread
SST25VF016B.pdf (351 KB)