It will be infinitely more expensive and harder than just using fiber. Two transceivers is 350 bucks total for 2km single mode. 200 for multi mode if you want

It will be infinitely more expensive and harder than just using fiber. Two transceivers is 350 bucks total for 2km single mode. 200 for multi mode if you want cheapest possible A 4 port switch is about 700 bucks. You could also do 25gb x 4 and aggregate at probably 1/3 price. You could upgrade later, without changing fiber. You could also go with the switch but use 25g transceivers, and upgrade the transceivers later. This is about 60% cost. In a year this will all be half that price. USB4 plus a ton of repeaters plus … is going to dwarf the initial cost of 100g fiber quickly. In 5 years, you will probably be able to run 800g over the same fiber if you are bored. A or aggregate 100g links. You would have to replace all the USB with new USB-9 2x2.4 SE stuff.