Irgy, can you explain why worker settler is more efficient than settler worker? The way I see it, if both are built in Sirius the pair of them will be done at the same time regardless of the order. If we build the worker first, it spends a few turns building improvements near Sirius, which we won't be able to use for a little while anyway. If we build the settler first it settles the city a few turns earlier, and uses those turns to get some extra food hammers and commerce. If we build one in Sirius and one in Canopus, it's different of course, but I imagined that we wanted to grow Canopus a bit before building workers and settlers there.
It depends a little on how delayed the worker is by the fact that the galley is busy dropping off the settler, which in turn depends a little on exactly where we're planning to settle. If the galley is back in time to pick up the worker then it doesn't matter so much.
We might not need a few extra worker actions now, but pretty soon I think we're going to be desperately short of them.
The city is going to be costing us a lot of maintenance, so I wouldn't exactly describing it as "getting us a little extra commerce", and without improved tiles it's not getting us all that many food and hammers either.
If we're settling near seafood, then a workboat in Sirius might give it a good kickstart.