I haven't played this out, but not building the road on the gold hill W of Sirius means the gold mine in Canopus would be completed about 2 turns earlier (turn 45), correct? He'd still have to build the road (1 turn?). That means the gold in Canopus would be hooked up no sooner than turn 46. In the plan I laid out Sirius would grow to pop 5 on turn 43, so we'd have happiness issues for a few turns, unless we ran a scientist instead of working the Forested Silk, or moved the warrior to Sirius. I decided to work the Silk to get to pop 6 as soon as possible, but perhaps that's sub-optimal. As I said, the micro I laid out wasn't necessariy the best plan possible, just a starting point for discussions.
The current plan is to build a warrior for the sake of an overflow hammer to save a turn on the library. The upshot of that is that we don't need the gold connected until 6 population, which should be plenty of time even working the silk. I think the silk is a good idea, as it will double our growth rate, giving an extra turn of the second scientist for each turn of the first scientist we miss. That works out as just plain better than working a scientist.
Ah I though Mono was on the path as well. No one has gotten it yet though so it is still up in the air.
Having had a better look at the tech tree, Mono is actually a huge detour. It requires Masonry, which we have no need for, and Monotheism is itself twice as expensive as the alternative Priesthood. In fact, even if we get Monotheism, Priesthood is so cheap that you save almost as many beakers of Monarchy from the pre-requisite bonus of Priesthood as Priesthood actually costs in the first place, so you might as well research it anyway. So Monotheism isn't really on the path to Monarchy at all.
So, we should only go after Monotheism if we either genuinely want and genuinely expect to get the religeon, or we really want to use OR (which we won't be even able to use unless we get a religeon anyway).
Between AH, Writing and Sailing I really don't expect to get any of the early 3 religeons.