Also if you're old you can go on a tyrannical banishing spree and die shortly over. If I really want to be cheesy I wait until I'm really low and I'm ill or stressed and then start the banishing.
Iron-fisted tyranny can also be sustained indefinitely at immense profit. It's an interesting alternative to the normal playstyle. I don't think that it's cheesy, either, just good old-fashioned tyrannical fun.
After banishing everyone, I usually have 30 or more holdings in my desmesne, and that means I have zero direct income. This low income means that I can hire new courtiers for one gold each, and I have hundreds in wealth from banishing everyone. So, I buy fifty courtiers at a time, and a few naturally will be 20+ stewardship, low intrigue, and content with my rule. This virtuous combination is what I call a
high docility factor. I give those most docile courtiers the mayoralties of my cities, but I keep all the ruling castles under my iron thumb.
Each courtier gets six or seven cities, so he still likes me even though I have hundreds of points in the "desmesne too big" negative relations. These are my brilliant little worker bees, my wage slaves. They'll give me taxes indirectly, and they are quite good at it. Mayors automatically double their stewardship skill, because they give themselves their own councillor bonus. Then I buy fifty young girls for one gold apiece and marry the most docile to my slave mayors as a reward for their service, and so that they can make even more money and hold even more cities with the spouse bonus. They make the money that my castles can't make because of desmesne inefficiencies. My castles are purely a means of political subjugation and oppression, not income, which my desmense malus zeroes out.
It's easy to make 20+ gold a month with never a trace of political dissent for decades. Eventually, usually upon the demise of a particular tyrant, just banish the mayors and get 300+ gold each. They all have low intrigue so they can't escape imprisonment; and if they
do manage against the odds, they don't actually have armies anyway, but you will have to lay siege to their towns. Repeat as needed.
As a bonus, you've got a lot of choices for councillors. The councillors needn't even be docile.