netstream.send will not work because you are not publishing with Flash.
You could inject cuepoints with timecodes server-side. You can use the compact version in the 2nd post of the other thread you are posting in:
http://community.wowza.com/t/-/238#2
Then, you will need to modify the player somehow to read those cuepoints in each stream and adjust them as necessary.
The governor will be the system clock on the Wowza server where you are publishing each stream at the same time, and injecting cuepoints.
This would take a fair amount of work and experimenting. I have not done anything like this.
Richard