Okay, so I know I said I’d share my scripts “as-is”, but I ended up working on them some more, so that’s why it took a few days. But now I’ve released them here: Freya Lupen / Procreate to Krita Brush Converter · GitLab
It’s an experimental set of command-line scripts written in standard Python that’s capable of converting some settings from Procreate .brush and .brushsets into Krita .kpp and .bundles. The scripts are quite unfinished and the resulting brush presets are quite broken, but it’s enough to go off of. There’s also functions to dump the raw brush settings of both the .brush and .kpp files into text files for examining them. More details are in the readme.