You can always worldbuilder it down a few levels
... the most important part of the first 100 turns is not research!
Well this isn't true for long... moving 1N loses the southern corn.*After border pop: settling 1n will net you 1 more food compared to SIP
After worker+second pop+second improvement is finished (how many rounds?):
You will work gems (settle1n) or the second corn with the option for gems (SIP).
The gems will help get the required techs out earlier yes, but that could also have been achieved with city #2 had there been no gems west.* This is pretty much the window where settling 1n is better.
You'd also have an option for 2x gems+corn pretty early.
On the one hand getting a head start is good even in the long run, on the other, corn is good enough to catch up. How long time does it take for SIP to catch up vs settle1n?
So is there any reason not to do mining-BW here?
Worker first, who goes and farms the 2 corns obviously. Do you go for an early second worker to help chop out settlers? Or just slave them (being IMP)?