I keep looking at fast Philosophy and Feudalism so Peter does not start building Angkor Wat and won't trade us Philosophy for 20-25 turns.
Since we are thinking about T127 Golden Age,
I'll agree to drop Courthouse if the team wants more food for Canal City.
How about:
T109 - Code of Laws to Sitting Bull for 10

and +diplo (we need +3 more fair trade to get to Friendly by T117)
T109 - T116 We tech Metal Casting -> Machinery -> then Guilds starting T117
T114 - Peter is done with Feudalism and hopefully does not tech Currency or Metal Casting or Paper next
T117 - If Sitting Bull has a monopoly tech like Construction or Compass, take it in trade. (Not Calendar, messes up bulbing!)
T117 - Bribe Peter into Confu for 6 turns with Map
T117 - Iron Working from Sitting Bull (Put all 5 workers on gems)
T117 - Trade Currency + Metal Casting for Feudalism
T118 - Trade Machinery + Paper for Philosphy (We pray that Peter does not start Education in the future)(We also can't trade away Metal Casting and Machinery on the same turn)
T123 - Peter naturally switches back to Taoism and is no longer Friendly.
We can't bribe him back to Confu until T128.
If Peter is a jerk and techs Currency, Paper, or Metal Casting on T114-T116, we prioritize getting Feudalism.
Wait for Guilds to try and trade for Philosophy and pray Peter does not start Angkor Wat.
Can we tech Guilds in 5 turns and be able to trade it on T122 while Peter is still Friendly?
Test game indicates that yes, we can, barely with the 10

from SB we end up with 0

inbetween T115 and T116.
Without Courthouse in Canal, we need another +20

from AI I think on top of the +10

from SB.
T127 - Banking for Aesthetics from someone?
No!
We need Aesthetics by T125 at the latest to build Parthenon in 2 turns.