The only real options (within Powerplays way of doing things) are to make transportation open only (even with its limitations- so solo / pg generate what open transports), make open worth more (so its a gamble), make merits / cargo vanish on mode switch / logging during combat (so its a 'loss' if you capitulate). In the end PvP is more about adding some form of limiting factor* absent due to NPCs. If its not, Powerplay remains trucking busy work.
Its also about teamwork too- in that Powers support each others pledges. Additionally you won't get a blockade behavior as you think you would for most of the cycle- the only time it will get hectic is at the last days and / or if you are doing actual Powerplay activity that requires the home system (which would need unifying to out or inbound for everyone)...that or you have an active Power / blocs such as ZYADA or FUC.
*If Powerplay went BGS like this could be flipped on its head by making all fort / prep cargo a mission cargo, you could then price in danger via more aggressive / engineered NPCs. You could then have missions that require players to work together (like wing missions promised), and not need PvP to generate threat.
Agree with what you are saying but from my point of view i enjoy PP, more importantly the fortification side of things which i can also add trade routes into, i have no intention of doing PvP in Elite so anything that forced me into that playstyle would prevent me from taking part.
As we have discussed before im sure there are plenty of folks that think along my line of thought, as are those who may join if more PvP was involved.
There are always those who want Elite to go further down the PvP route, that's fine, but there are also many who would have loved (like me) an Open PVE without having to join a different server.
We are lucky in that we have modes we can chose from, i wouldn't like to see any of the games content locked behind Open PvP, we had CQC for that and frankly, it failed.
O7