It is quite evident from your post that you do not want Lebanon to develop into a modern, progressive state. You also want to enshrine sectarianism, divisions and even hatred into our existence and create and cement barriers to promote your sectarian apartheid policies. You care about a sectarian identity. Others have the right to care about a national identity and aim to become full fledged citizens in their country. Berri and corruption are just the bogeyman you are using here. There are countries whereby the central government still collects taxes. Most of our taxes are indirectly collected. On phone use, on internet, on electricity, on garbage collection, on fuel etc. So I really dont know how you'd end up collecting taxes. It can only happen by setting up parallel govts.
If left for me, I wont mind we divide Lebanon into two a Shia majority state that extends from the South, up to Dahyeh and into the northeast of the country (Baalbek-Hermel), and another Christian-Sunni mix in the Northwest starting from Ashrafiyyeh, if you like. There would still be about 20 or so Shia villages in the Northwest. If you like, you can give Tripoli autonomy. But sorry, we dont want to multiply the mess we currently have. Its either we divide the country or we stay where we are. Trust me, we arent happy to be in the same country with many people, but we dont have a choice. If a Shia majority state would be created all the way from the South into the Beqaa and south Beirut, then I don't mind. Sort yourselves out with the Sunnis in the North. You can choose to divide territory and give Tripoli and Akkar independence. Basically, the end of Lebanon.
So these are scenarios that may come up if you think you can outsmart others.