For what it's worth.
- Select all your Lines that need a Fill.
- Clone them.
- Join Shapes.
- Add a 1px Outer Contour with a Mitre join.
- Click Inset Path (Shape of Lines).
- Cover this 'Shape of Lines' with a Box of the required Colour.
- Select this and the 'Shape of Lines'.
- Combine Shapes > Intersect All Shapes.
- Discard the outer offcut.
- Fit inner shape to original Lines.
Acorn
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