They werent effective. That is the thing. They were disruptive for the region, yes, but unless the region got foreign (military) experts and massive financial support, it didnt really account to anything. Greece as an example simply would have not existed in the 19th century, if it wasnt for 3 european superpowers interfiering on behalf of the Greeks.
The legacy of (Napleon's) revolution is much less the change of leadership to republics (something that basically happened post WW1, arguably even post WW2), but the constitutional changes. I dont think EU5 will have an entire proper constitution system, so the entire revolution thing is going to be very abstract. Spreading it with some money/manpower is not really a proper depiction of its effects. The Ottomans as an example initially copied the french constitution in their process of modernization. How would you force this/naturally make it happen? This is Vic territory. Not really EU4/Eu5 territory.