... with occasional spikes if some additional insight suddenly comes up.
I hate it when this additional insight negates a couple hours work as tends to happen from time to time when I realise I have missed something fundamental. Better late than never of course.
Have you ever tried the exercise of writing a question but answering it with your weak hand? It is messy and slow but quite interesting. The idea is that it accesses different parts of the brain.
Have not tried that particular exercise... but I have done some of the art exercises that require you to draw things with your non-dominant hand. And it was a bit strange how different things looked...
I taught myself to write in mirror. That also slows me down a lot, and activates some strange parts of my brain, and at least makes me feel more connected to what I write & makes me think better before I decide on a word! But I will try your option too... sounds very difficult!