I am not from around here, but isn't it possible to just bind /system to system.img in any directory, and then boot it from there after the same has been done for /data and /cache?

R.I.P. Miranda Nicole
An innocent soul, who deserved to live a lot longer. We all miss you.

R.I.P Alif Shahriar
A true friend, no longer here in this world, but always there in our hearts. We sorely miss you.

Owner and creator of Oxydo kernels for Nexus 7 2012 (Grouper/Tilapia) and Xperia X8 (Shakira)
Maintainer of AOSPAL for Nexus 7 2012 (Grouper).

My blog: http://alltheengsawesumz.blogspot.com/
Circle or chat: https://plus.google.com/+FayadChowdhury