Can the Busybox init start a process as unprivileged user

I have a tiny, tiny system comprised of Busybox, an executable application and its dependent libraries ONLY. I am using the Busybox /etc/inittab to start the application as an unprivileged user: ::sysinit:/sbin/ifup -a -f ::respawn:/bin/busybox su unpriv-user -s /bin/sh -c 'my-executable --arg val --arg val' The system has nothing else, and I don't want to install anything else. Is there a better way to instruct the Busybox inittab to start a process as a given user, or is using su like I have the correct way to do this ?