To avoid having to go into boot recovery, please try downloading and manually installing the statically-compiled Python 3 version of eopkg, and finishing the update with that:
Note that this just downloads and extracts the files to your current directory; it isn't actually installing as a system package.
/usr/bin/wget https://packages.getsol.us/unstable/e/eopkg4-bin/eopkg4-bin-4.0.0-17-1-x86_64.eopkg
/usr/bin/unzip eopkg4-bin-4.0.0-17-1-x86_64.eopkg
/usr/bin/tar xf install.tar.xz
sudo ./usr/bin/eopkg4-bin up