No Democrat is seriously looking into real electoral reform that doesn't benefit their party. First-past-the-post will never be changed under their leadership. This voting system allows them to shift blame to voters to the left of them (that they alienate) for voting Green/et. al. They engage in more voter suppression activities than they spend time arguing for serious electoral reform.

https://www.carolinajournal.com/nc-democrats-forced-to-pay-green-party-for-frivolous-intervention

https://apnews.com/article/wisconsin-jill-stein-harris-trump-lawsuit-405e8bae8ff9becfa81a1360708d59a0

https://arizonaglobe.com/legal/democrats-sue-to-block-green-candidate/

https://thenevadaindependent.com/article/nevada-democrats-sue-to-block-green-party-from-2024-ballot

https://dailyinterlake.com/news/2024/aug/27/montana-dems-sue-to-keep-green-party-off-november-ballot/

It goes on and on and on and on if you look at lawsuits and complaints against other parties or look further into the past.

If Democrats had even 1% of the fight that they have against third parties and put that towards positive change and actual solutions, they would've been able to accomplish some of the things you listed.