Missing my point. My problem is that if you play a single game of BFG and then play SH for the boarding battles, you can spend a lot of time not playing BFG. My other point was that you're then dedicating a day to playing SH; even if you call it a campaign, you still can't play it one battle at a time because you would have to cut your BFG game into little pieces - if you would otherwise have time for a BFG game, you might have time for a single turn of this particular brand of BFG.
You could possibly do this sorta thing with some sort of blitz ruleset for SH, but it'll probably still take too long and you'd no longer be playing SH.