You make some very good observations and suggestions.
However, When it comes to “highlight” packages and similar content - and most sports covered by tv have them, there is still the need to have recorded the original content before editing the final programme. So for me, the question first & foremost is which production company is going to fund that exercise so that a main stream tv company will broadcast it - and at a worthwhile time of day.
The organisations behind darts, Snooker & suchlike actually produce their own content (live & catch ups) providing content to the channels - If UK speedway is to do the same they need a good reliable quality production company including commentary from professional folk who are not necessarily ex riders “doing their best”
Maybe the “exciting news” for next season hinted at by the Oxford promotion regarding the leagues set up for next year will also include a change in media coverage with TNT moving out being the first step?
We can all but hope & wonder what next?