It won't work. widevine-drm is dependent on the backbone C-lib, it needs GlibC.
I also run Void with musl-libC and Netflix doesn't work. On the other hand, I can set a GlibC based distro on a qemu.kvm virtual machine and everything works then.
The reason Netflix works on Linux is, basically because ChromeOS is based on Gentoo and, well widevine comes from Google.
Yes, normal qemu would do, but everything is so slow...
I can, obviously, try both HAXM and NVMM, but would prefer to set-up only one of these as my SSD is somewhat limited in space