Hello and welcome to the forum!
My knowledge of Blender is not sufficient to say anything specific here and node-based work is completely foreign to me, but could one of the three plugins connecting Krita with Blender possibly help you?
Each of these plugins has a different purpose and again, I’m not really sure what they are for, but maybe one of them could help you with your project?
Blender Krita Link: plugin for texture editing in krita
Plugin: Blender Layer - Live 3d View in Krita
View3D plugin to view/modify 3D mesh with the current image as texture
But with Layer Nodes they don’t have to do!
Michelist