./cjdroute --nobg < /path/to/cjdroute.conf
Uncomment the TUN SECTION of the conf and launch it like that. Your node will switch traffic, and peer effectively, though you will not be able to run services.
You have the option of configuring your TUN device manually. It will require root, but once established, cjdroute can otherwise run as an unprivileged user.