Don't have time to think at the moment but if we get Astro we can build galleons, which will save time sailing up north. Would we have the pop to whip one quickly? If not, build a galley (before getting AStro) and then get Astro and upgrade it. Keep in mind the missionaries don't always work the first time.
I'm happy for kcd to play.
Oh yeah... we obsolete a bunch of shipping with Astro. A Galleon costs 80hammers so we can 3-pop whip it after investing a single hammer in it. The turn we lose investing the hammer is gained during travel, and an additional turn is saved for every 3 turns of movement. With luck that could get us there by t17. If we instead whip a galley and then upgrade, we still lose the turn. A caravel costs 60 hammers so a 3-pop (90-hammer) whip probably isn't possible until we invest a hammer.
So it doesn't look like we'll save any time by keeping caravels/galleys(40)/triremes(50) available, and maybe actually lose a turn not going for Galleon direct.
And yes, with a galleon there is the ability to bring 2 missionaries on the sea route while one takes the land route if there is one.
Of course, this means that taking Memphis BEFORE Satsuma comes out of revolt is a MUST, or otherwise that pop decreases to 5 and we have a long wait. The 9 tile region after revolt produces 9 food, so that should keep the pop, since the trade connection by freeing up Memphis' culture borders lets Satsuma get benefit from our health resources.
So I think the plan works... just substitute Galleon where it says Caravel.
I'm going to go ahead and play a few turns, since the plan that was green is still being followed except for some details. I know you guys are as anxious as I am to see the other team's threads.
17t... cross your fingers!