Nice idea!
Long term, I have concerns about which metals see the inside of my KK. I've heard that anything chrome-plated off-gases substances one doesn't want on one's food.
My simplistic theory of bolts is that they're either "stainless steel" or "don't ask". There are variations in quality for either, but I stick to pure metals (cast iron, stainless steel) inside my KK. Bolts I have around, I simply don't know.
Years ago, another solution to avoiding flour paste for the lid was to make a "smoke bomb", what would be a pipe bomb if there weren't three little holes along the bottom (don't forget!). Fill with smoking wood, screw on the cap. These were made from stainless steel for the above reasons, and thus very expensive.
I like flour paste. It reminds me of how Moroccans would use pots that didn't fit, steaming couscous. And whenever I flinch at a few steps in cooking, I remind myself that the entirety of my manual dexterity tasks for a day is no match for ten minutes of practice by a concert pianist. Humbled, I just get it done.