The 'free' spy report option is unbalanced (My uber-spy countries have survived FSes more than once because they just couldn't op me in a reasonable number of turns) Other than that you've got some interesting ideas.

Particularly the market bribe. I would see that needing to be moderately expensive so it's only useful on rare occasions but it would make turn around in the event of an alliance getting jumped that extra few hours shorter. Could really make warfare a lot more interesting.