What I do for an interesting smudge/blender brush is take a smudge/blender brush that already exists that I like, then change the tip (or brush head) to what I want from the editor’s library of tips, then make any further changes that I need. You can put in a texture in addition to the tip and make adjustments. There’s videos on YouTube about making/adjusting brushes in Krita.
If you have Krita 5.x… you can import these blender brushes that I adapted and change what you need:
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