I would just cover it with decent cotton or linen bed sheet, maybe sow the edges so it’s like a big pouch. That will take care of the dust and allow it to breath, a sheet of plastic over the top but that sill lets air from the sides would be another layer of protection from the dust settling.
You can buy premixed Ripchord Plus from Mitre10, it would only need a light squirt every six months to stop any insect damage (treating the cover not directly onto the mount).
If you need to protect it from physical damage then a crate/spare room/hang it on a someone else’s wall.
What a fantastic trophy
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