I think zyxy's plan looks good for at least the first 10 turns, so how 'bout CB play those and then when he does his scheduled 10-turn break, we can revise as needed.
A little pre-revising brainstorm session...
If there isn't anymore land, I think we should consider putting the 2nd city on the BG in the southeast. We lose 1 turn in moving the settler and also lose +1spt (until the city gets to size 7, right??), but we gain more coastal tiles for the 2nd city. I'm guessing that if we are indeed isolated, we'll probably get aqueducts and harbors in our starting cities before we're able to jump to another landmass. Perhaps we won't be able to spare the shields, but the ducts and harbors--together with plenty of coastal tiles--should gives us a fair bit of commerce. I'm hoping for whales or fishies in the fog to the south.
Also, if we place the 2nd city on the BG, we save our worker from having to build one more road. Truth be told, I'm still a little hesitant about joining the worker. I know joining will keep our capital above size 1 always and speeds the research at first glance.
If we join the worker: According to zyxy's sheet...
We'll have 73 spare shields post-building the settler until we get alpha. Those 73 shields could be:
- Seven warriors- Dubious. No $$ for upgrades, only possible iron nearby, unit support issues
- A temple plus "other stuff"- Maybe decent
- Granary- good if more land, but we need Pottery.
- Wealth- Possibly.

Wealth intrigues me. Pre-Economics, I think C3C gives 1gpt for every 4spt. That means we'd make 18gp extra with those 73 shields. That would speed Alpha at least 1 turn, maybe two.
IF we didn't join the worker, but instead had him mine like a fiend, we could have him mine the cow, the capital's BG, and one other flatland tile after doing his roading work (assuming we settled the second city on the other BG). That would translate into +2 or 3spt and if we built wealth, more gpt.
My calcs are very rough, admittedly. I don't generally like the idea of building wealth in the capital

, but in this case it might payoff the most, better than a temple.
Basically, I'm thinking IF we settled our second city of the BG and IF we didn't join the worker but had him mine instead, we might make up the gpt we lose by NOT joining the worker. I think we still lose a bit, but it's pretty close. Plus, we'll be in much better shape improvement-wise when the time comes for us to pump units. We do lose out on a temple build, but we'd still have a worker around, saving us 10 shields in the future.
Of course, if there's more land we could have the worker build a big road to somewhere. That
would kinda negate some of the "don't join / mine instead and build wealth" argument.
If we do join the worker, I think the second city needs to make a worker as the first build.