Did you ever get Sailfish working on the X23 ? I have the Volla X23 in the US and its been working for almost a year. I have both sims connecting to Mobile Data using MVNO Unreal Mobile and H20 Wireless. After six months of trying I got dual boot working and now have Ubuntu touch running but its not make and outbound voice calls, just texting. I am trying to see what I can do to get that working but I would love to have a triple boot as you have described using Sailfish OS, pure linux. Do you have a link to some instructions to how i can install Sailfish as the third OS ?