I like it, even though half the ideas royaly screw my playstyle. Way too many ways to prevent culture flipping.
Non aggression - reduced influence flip ability (not entirely blocked), requires breaking like current alliances. No planet spies (assuming that's still in).
Mutual protection - same as current alliance, requires non agression
Military (support) alliance - as listed above
Economic bloc - requires at least three civs; trade bonuses, additional trade routes between members, and about half the current value of econ treaty per civ.
Cultural exchange - again, reduced effectiveness of flipping (more so than non agression), otherwise I love it.
Scientific cooperation - I'd split it. I prefer the current research treaty setup, but maybe with an increased chance of stealing tech from the treaty giver. The sensor data should be something like this: you can trade it to anyone, for a per-turn price. Making 10 bc per civ per turn to sell my sensor data, where do I sign up?
Co-prosperity - pass, it's just too overpowered, and as currently set up would actually penalize you for getting unification.
Unification - Better than the current diplo win, I guess. Harder, anyway.