Tried the following, all without success:
- /etc/init.d/browserd stop, changing the bookmarks and then /etc/init.d/browserd start
- lipc-set-prop com.lab126.pmond stop browserd and then lipc-set-prop com.lab126.pmond start browserd
- lipc-set-prop com.lab126.pmond kill browserd, then lipc-set-prop com.lab126.pmond stop browserd and then lipc-set-prop com.lab126.pmond start browserd
lipc-probe -a doesn't show anything that seems relevant either so I guess it's not possible to do this. At least it's easy to automate the reboot by running
/sbin/shutdown -r now over ssh.
Thanks for the suggestions though!