Not the OP (and this is basically a year late) but I went ahead and made a template .kra for this.
How to use:
- Use vector tools (ex. the line tool) to make divisions on the layer labelled “Borders”.
- Draw on the layers below them.
- Optionally, select the areas in-between the borders using the wand tool and use transparency mask to make alpha-layers for panels.
- Edit the borders by using the layer styles menu on the Borders layer or with the vector selection tool.
Enjoy!
Template Download link: https://drive.google.com/file/d/1UYblVgDmr9EggGaXSqmZgV98UQdPP3AV/view?usp=sharing