Could you just cover the wire shelves with hemp mat? It would need replacing if pee'd on though.
Prevue make these - not sure if they would fit
https://www.amazon.co.uk/PREVUE-PET-...275956&sr=8-18
Or just get wood ones and paint them with a couple of coats of plastikote
Ranchhouse cages make wood ones in all shapes and sizes and they come with good fittings to screw to the bars.