I've updated my fork
with latest widevine fixes.
Tested with my alfawise a8 build (that works on my box) and works very well.
Keep in mind that libreelec addons maybe don't work anymore because the official repository for rockchip rk3328 (but compatible with rk322x) seems unreachable. So, I'm building addons from source.
Edit: build and some addons (for now only inputstream.adaptive) on