I have said before and I’ll repeat it again. The NPE has to be PvP focused. What’s the point of new players essentially belt-feed into the content mincing machines of the Big Five? Because that is what has been happening. It is also why, giving players some sort of option to fight back is doomed to fail. (particular when new players are led to poor choices from the start and spend six months training industry skills).
I would seriously suggest you do actually do the opposite. Made wars cheaper and last longer. Do not bother with the entire Social corp or Structure Requirement. Increase Concord reaction times. Give the Belligerents exactly what they want.
But in exchange for this, Null Sec has to step up. If you sit around and agree to parcel out moon-goo for profit; then Blue Donut can agree to work cohesively the save the game from itself. They move to pro-actively recruit directly within the Starter Systems. Sever the flow of players into the high-sec mincing machine. This fits within well within the primary meta that players linked within a social context are more engaged with the game. If Null can do it well enough, then Big Five starve for lack of content.
On the other side. I would direct you to review how effective tightening the mechanics of suicide ganking have proven. Hint: not. A rule system to govern wars-dec would have to be a lab-rat maze to have any hope of moderation.