I have been using LLMs for this and they excel and understanding my very poor calligraphy. All I do I take photos of the pages I wrote by hand, and then ask the LLM to convert those notes to markdown and convert any diagrams that I might have to mermaidjs style, and worked wonders for me.
Ultimately I want things to in text documents though (typst for me these days). If there was a non-slopware solution to ocr scanning to a typst doc, I would do it a lot more .