GitHub - Acly/krita-ai-diffusion: Streamlined interface for generating images with AI in Krita. Inpaint and outpaint with optional text prompt, no tweaking required.

Just install ComfyUI locally, use their AMD Linux install guide, then install the Models and Extensions that KritaAI needs, as mentioned on their github. This way you can easily use the full Comfy, which is what KritaAI installs an the backend, and just select local Server in the KritaAI options to usw your local install. Works perfectly well on my Arch system with a 6800XT.