Which could be more expensive, create possible calculation issued with NCB and MTA considerations. And lovely negotiations with the base underwriter, I can see their faces now, …… It would mess with their policy and risk analysis, I can see much head shaking!!
Seriously though, I have seen some variant approaches in the past and some can work, look at the older Elephant 10 months policy for a years NCB, etc
The fact you think a policy like that would cause underwriters to shake their heads makes my day. Policies which only reward after 12 months are the past, imagine being able to gain NCB month on month, Imagine a policy based around you, when you want cover, thats the end game.
I understand your scepticism, its totally justified however its the reason companies like mine exist.