Ok so I'm not volunteering to lead but rather asking that someone with the skill/time/will to start this.
I've been thinking about housing and renting and mortgages and I think I have a reasonably doable idea. But it needs a lobbying angle to be successful: push all morgage applications to consider rental history as a significant factor in the undersigning decision.
This is by no means the perfect answer but the best and most realistic one I can imagine actually being successful in the current system.
I mean, Experian will let you incorporate your subscription and utility bill history if you ask for it, so why not rental history for mortgages. It has to be a more accurate indicator of risk than credit history, doesn't it?