P) See http://voteliberalist.org/ for an interesting UK experiment (PInteresting indeed! I would summarize their "manifesto" as: tax land value and carbon instead of income; vouchers for health and education, free trade; eventual open borders; suffrage at 16. Not nearly radical enough, but some good policy directions in there. They remind me of the Democratic Freedom Caucus Platform and the TP96 Common Ground Declaration.
I agree libertarianism needs to turn toward the Left -- especially toward 1) using green pricing to defend against environmental aggression, and 2) ending the appropriation of site rents and "intellectual property" rents. These principled stands against aggression should resonate with the Left, but not even all libertarians agree with them.