Hi amuctued. In dCore-buster64 you only have xorg-all installed? You will also need a window manager loaded and that window manager listed in /etc/sysconfig/desktop. Thanks.
Also, dCore-buster64 for me finds openvpn with sce-import. Using "sce-import openvpn" produces the following results, and when choice 1 is imported, imports 33 packages total:
Select package for 'openvpn'.
1. openvpn
2. openvpn-auth-ldap
3. openvpn-auth-radius
4. openvpn-systemd-resolved
Enter selection ( 1 - 4 ) or (q)uit: