Okay, so here it is:
https://github.com/pcm720/retroarch-clover/releases/tag/0.2_mod
You
must remove previous RetroArch modules before using this release.
Unpack additional cores from cores.zip
Install retroarch_mod.hmod, then install the cores you want. (put the .hmod files in user_mods, install via Hakchi2 as usual).
Please note that if you want to install multiple cores that emulate the same console (e. g. GLupeN64 and Mupen64Plus), the latest core (in order of installation) will be used to launch games from NES' GUI. So, installation order matters.