Rakly3 You already implemented an option for download-only versions of your videos, which are not used in the streaming environment. So all you would need to add at this point is a second file alongside the extremely large original version, which is also download-only. The streaming part of SLR wouldn't be affected at all by that option.
Your explanations about the streaming limitations are all understandable, but they don't explain why it's not possible to offer a second download-only option. The reason why this doesn't happen can only be guessed from between the lines and from the company's general behavior/direction.
Why can't the reason be spelled out straightforwardly to create a reasonable basis for conversation about possible solutions, like a higher tier subscription for download users?