[maxxpower]

Wow thats a TON of wishes and a complex task. You can buy a live encoder and external mixer and mix live signals to the encoder then live to the internet. Because you are already using streaming cameras, it may be difficult to switch during a broadcast. Although, Boinx software seems to have a solution to mix video and broadcast to live stream. Their documentation doesnt exactly state how many live stream inputs they support so you might want to send them an email.

[mixmax]

Thanks a lot for the reply.

Yes, it is quite a lot of wishes, especially give our budget of 0. That doesn't mean it can't be done though :-) I'll check out Boinx.