Yep - this is your problem right here. No one cares! 
By that I mean no one cares about the SHOT, your not making a film, this is not art, this is training, it needs to be useful.
Issues:
1) **Stop worrying **about the Shot and make it functional (Stick a big monitor right up in there if needed - ask community if they care)
2) Upgrade the OS, I mean seriously guys? Use a VM to test compliance, even on my 5 year old rig I can run several VM’s for testing, and all you need here is the engine and streaming software.
3) **Upgrade the System **two instances of UE4 is too “heavy”? really, what are you doing there… Build another RIG, build two - if funds are an issue ask the Community - we’ll run a competition to build a rig and have it used for the Epic streams - hell even manufactures like Nvidia or Corsair would do the same… There is Zero reason not to have the equipment needed here.
5) I can’t count, can’t count the number of times I’ve cringed at how awkward and annoying you are making it for Your Own staff to use the setup you have.
These are people who take the time to do the training, and work hard in the background getting it all ready. I bet there are staff that avoid the training streams specifically because its difficult to see and use and work in that setup - It’s just not a comfortable place to be.
(TD = Technical Director) Hope you have a tricaster if not http://www.newtek.com/
There are so many better options, here is one.
How about prerecording the segments, which the TD can incorporated into the stream as needed, this would then be fullscreen, with original audio, or you could talk over / add commentary live.
(These could be then recorded by the staff - in there own time at their own desks with simple audio and screen capture software)
This would mean the “live” section of the live stream, would be a relaxed affair with people sitting back chilling and chatting about the training, and answering questions - incorporating any little “shorts” as needed.
Imagine a world where StaffA is working away and knowing a training stream is coming up next week on AI, fires up screenrecorder, and just does a 2min short showing how to do xyz.
Imagine in this world Every staff member can upload these shorts to your server all indexed and ready to be used as and when needed.
Your TD will be sat there with the videos, and a ever growing “shorts” list, which could be used as and when they come up, or as filler.
All they would have to do is switch between the guys chatting, and relevant content. TD - “oh hang on guys, I have something here that StaffA did that explains that part” - rolls vid
Another -
Build another studio for training, if you have to - have desks with 4k monitors, with a couple of cameras for each. You could even get a 3D Camera for $300 THETA Users could then rotate around themselves, to see the screen or the person talking, and the staff will be sat at a desk in the best environment conducive to training.
I really hope you sort this out, your engine is fantastic, you are doing almost everything right, more people are coming to the fold to learn about it, here you seem to be specifically making it difficult for your own people to teach others just because of inappropriate equipment, six year old operating system and some ill advised artistic studio look you think is expected.