I have been working on a MyPaint brush engine for quite a while now. It lets you use MyPaint brushes on Krita and also edit them. It seems to work fine mostly but we don’t know if that is actually the case. It would be great if someone can test it and provide feedback.
Here is a link to an appimage package: https://yadi.sk/d/_EW4t2wjyaRGrQ
For installing new brushes you can unzip to or move the brushes to “usr/share” folder or you can also use the default presets which come preinstalled.
You can select the installed MyPaint brushes from the preset chooser. Something like this.