Nice thread! Many of the posts here game me an idea.
Put her on a wheeled cart that has a pillory for her neck and wrists on its floor, so she is lying naked on her back.
The cart also has posts, to which her ankles are fastened so that she is spread-eagled, pussy and asshole open and exposed to all the world.
Have a contest. Give all the spectators along the route numbered lubed up dildoes. Any spectator who successfully tosses a lubed up numbered dildo into her open pussy or asshole gets to have oral sex from her just before she is crucified.
The wheels of the cart also actuate gears on the posts to which her ankles are bound and on the sides of the bed of the cart. To these gears are tied several feathers which mercilessly tickle her exposed armpits, ribcage, thighs, calves and bare feet with each and every turn of the wheel so she is screaming with laughter all the way to the crucifxion site. A catheter in her urethra is connected to a funnel bound to her mouth, so that she is forced to drink her own piss from laughing so hard.