Thanks for the pinout details. In the mean time received the 16pin clip, but will will do some experimenting somewhere end of this month.
If I'm not mistaken I have access to at least 2 or maybe 3 experia devices with dated firmware versions (exploitable). If I'm able to backup these flashchips are you interested in the files to see if a easier exploit can be used for flashing OpenWrt without opening the device?