@cbalaki sorry, I unfortunately was out and about whilst this event was taking place. As many other users ascribe, using live events across a tenancy (specifically an education institution) can only work when it is self service, as the central team don't have capacity to provide producers, so they definitely don't have capacity to provide even more bells/whistles in the form of external encoders. 
Not sure if you are familiar with the blackboard learn platform? They have collaborate ultra which allows uploading of content for moderators to use. It converts pptx or pdf, and the content can be shared by any presenter, and all presenters can forward through the slide, or push to a specific slide. It would be much easier to have this within Live events rather than using more kit.. Happy to give you a demo of collaborate at some point if you would like to see how that feature works. Let me know :)