That's hard to look at
Use your bimini top. Place it upright, but not unraveled. Use heavy mono (100-200lbs) to secure it to the bow and stern cleats to create the "spiderweb" to keep the birds out. Also tie 3 or 4 plastic bags along the bimini to discourage birds from roostering.
On the 101' yacht I run, while in New Jersey for the summer, we must rig a suspended plastic owl and a spiderweb of mono over the hardtop, otherwise we wake to a terrible mess every morning. But when "Hootie" and his monofiliment friends are on patrol, never a problem. What I've found with the owls is they must be suspended and move/bounce around. Just stapping an owl to a mast doesn't work, it must be deployed in a manner where it has some movement. Then the other birds stay away.
Good luck.
Lloyd