Kai, the code problem with this is that interception and running blockade battles are resolved during the naval movement phase. I looked into this and could not determine a clean way to introduce third party resolution as in the combat phases? It requires exchanging battle files during the movement phase, not the combat phase. I'm not sure it's even possible to do this, but maybe Marshall could look into it if/when he returns to code development.
My humble suggestion is to resolve these naval battles in parallel (one using the game's regular naval combat, the other using third party resolution), and afterwards using the PBEM admin menu to implement the third party combat results (ie, change battle losses, final positions of winner/loser, etc.) This may not be ideal, but should work?
I think that might work. Just ignore the in-game results, and use the admin editing to input the tabletop results.
I will have to play around with this and see.
Not as elegant as an in-game solution, but it may be a viable work-around.