What do you mean requiring a monitor / display plugged in? I have some connected, but they are all powered off.
Perhaps one of them does that thing where it does not disconnect from the system?
In regards to bandwidth, If you are emulating a PS Vita, no need to stream 1080p content? You can setup the script to limit the UI resolution to 480p! Perhaps that may help?
For me, this works, and is quite fun to use! I am sad that it does not seem to work for you?