I think it will be worthwhile investigating running surfaceflinger, and anything else it interacts with inside a systemd-nspawn which is an easy integrated way of using namespaces and other virtualisation features mentioned earlier in the thread.

Reasonable primer on systemd-nspawn: https://rich0gentoo.wordpress.com/20...-nspawn-guide/

Additional crazy idea that probably won't work, use Xvfb to create a virtual framebuffer on the android side and use XWayland to display on the sailfish side. Slightly rube-goldbergy but maybe worth investigating.

EDIT: More food for thought http://mer-project.blogspot.fi/2013/...u-drivers.html

Interesting stuff about wayland, more specifically wayland clients and EGL: https://jan.newmarch.name/Wayland/index.html