My (Sailfish X-flashed) Sony Xperia isn't used in production (yet. I'm still waiting for a few Sailfish X fixes before putting my Jolla 1 into retirement) and would happily volunteer as a sacrificial lamb to test potential new kernels. I just completely lack free time to compile them myself now. BTW, did you find a way around Sony's MSM platform kernel drivers failing to compile when module support activated ?