I was thinking about this the other day, what if you just put a block on the boom, like he has for the out haul, only the next larger size, instead of running the mainsheet all the way down to the tramp? I know the boom would have to be beefy enough to handle the load there but it might be stronger than the tramp, and that would keep the mainsheet up out of the way of the spinaker stuff on the tramp. Has anyone seen it done like that?

In that first picture you can see he has a larger ratchet block on the tramp but it has no clete with it, why not just run that right off the boom instead of the tramp?