All I am saying is where tribalism is pervasive - it not possible to checkmate an executive PM - who comes from the largest party (read tribe). You know those Mps will not want to attack the Muthamaki because voters down there will see it as a betrayal.
We have accountability even in the current system. It fails mostly because of lack of issue-based politics - due to tribalism and corruption.
All such a system will achieve is a whole lot of noise & drama from the minority and PM & the majority will always have his way.
The solution is to make PORK & National organs really deal with national issues. Trump can be dangerous but internally in US - nobody really cares - because his impact - at the state level is very minimal. Few people ever get to deal or meet federal officials.
So we just need to continue starving the beast - in Nairobi - by sharing power to counties, to independent bodies and organs.
I get but Kenya has never been proper parliamentary - except maybe Jomo for 1 yr. Then it become corrupted hybrid and federal discarded. It was designed like the UK but greedy Jomo clique messed it. After that almighty PORK was a sacred cow. So it was a sham parliamentary system until 1992. Jomo and Moi never sweat it out on the floor like UK PM.
About the UK or Europeans you venerate as nation-states - actually they are quite segmented ethnically - and have only managed to be cohesive due to parliamentary and inclusivity. UK for a start is England, Scotland, Wales, Northern Ireland. Go to Wales and you have small clans.
Accountability is actually needed more when you have diversity. Not the opposite. You can't say you don't need to accountable exec because we are tribal. We need it more for exactly that reason plus impunity. Basically PORK or PM needs to be made a JOB - not a beatification.