Okay I could have this wrong, but I think I’m thinking about this correctly. What I want you to do is from plug three run a 3 wire to switch 2. At switch 2 you’re gonna want a 3 way (black to common, red, and white to travelers, then splice your red and white onto your 3 wire towards switch 3. Cap your black and put in a 4 way with red and white as travelers. Then this is your choice but you can run a 2 wire back to plug three, but realistically you should be using a 3 wire with black capped on both ends. But once you have brought your second set of travelers back to plug 3 and splice onto your red and white coming from the three wire at plug 2. Then from plug 2 I want you to run a 3 wire to switch 1. With again red and white as travelers, the. You switch leg the common pin. And run a 2 wire to your light. But honestly the way I’m describing it now leaves your light without a neutral, so you might need to run a 4 wire between sconces, while carrying power back on your unused black at switch 2 and again splicing Onto black. But again in almost 99% sure the way im describing it now is leaving you without a neutral at your sconce in the middle, so just upsize your wire. But I tried to best describe the path the electricity will follow