Speaking of Santiago, we could test if it's possible to raze any of Madrid, Seville, et cetera, after gifting to Asoka and re-capturing, if KK is still alive.
I already tested multiple AIs having Culture in a City and their total value is compared against our value.
So, for example, one testing result was:
2 of our Culture + 3 of one alive AI's Culture + 4 of another alive AI's Culture = allows us to raze the City.
Don't forget that we might not want to be at war with Asoka... he could take a gifted Coal Resource off of our hands if we find that we have too many Coal Resources. Every Coal Resource that we connect will give us extra Flasks (which are kind of useless) and cost us more in Maintenance.
Are we planning to draft any of KK's cities?
I don't know, but it would probably have to be a non-core City for us to get the 10% Culture required, such as Zaragoza, and that City is rather far away from the action. Either that or we'd have to put a bigger priority on eliminating Kublai, which probably isn't really part of our critical path.
Has Kublai really not attacked Madrid, even though Madrid has only a Mace and Barcelona has two Crossbowmen within reach? It's probably worth it to send our Musket at Madrid-1W to Madrid-1N, just in case.
One of our Razed New Cnip Muskets should either guard the dude who razed the City or kill off Asoka's nearby Archer.
Asoka has another Settler in Thessa.
As for Subs... they have 24 Strength. I thought that we determined already that the highest-strength unit on the map at the start of the game had 6 Strength.
Recapturing a City (such as Konya) not only shrinks the City Size but empties the Food box and the Hammer box. There's also a risk of any Buildings (such as the Granary) being auto-razed.