Riot removed the funnel nerf recently so the strategy is back and viable again. If you are in a duo queue and tell your teammates it is often successful. I will be telling you the best ADCs for the new version of the funnel strat and the new pathing for it.

Kai'sa, Jinx and Tristana are, in my opinion, the best for the new return of the strategy. The best jungler for the strategy is either Nautilus, Braum or Alistar. The new route is optimized for those champions yet can work for others if necessary. The route is:
Red Buff- leash
Raptors- Jungler smites big one immediately then you smite it after then kill the smaller raptors
2 mid waves- Allow the jungler to get as many relic shield stacks off on minions as possible
Blue buff- Save smite
Rift Scuttler- If it is up then take it with smite.
2 mid waves- Again allow relic shield stacks
Wolves- Let jungler tank
Mid wave
Gromp
Mid wave
Raptors
Crugs
Recall- You should be able to complete your jungle item and maybe be able to grab some other things.
This route can be adapted yet I find it works best and after your first back you can really start to look for ganks which can be done with the new funnel strat.
*Please note*: Blue Buff is imperative for quick jungle clearing as you need to spam your abilities so it cant afford to be lost. Make sure it is warded so you can counter jungle if necesary.

Thank you for reading. If you are interested you can look at my champion builds and guides for all the aformentioned champions as they are the building blocks.