Absolutely unrealistic and probably unpopular. I want to take a girl who's absolutely not into this crap, put her in heavy bondage either standing or strapped to a stroller, and fill her holes with vibes and toys, plus clit vibes and nipple vibes (just full hyperstim). Strap a huge enema to the stroller or put it in a backpack if she's standing, and have it running to an inflatable plug nozzle in her ass. After all that, put her in some absurdly thick diapers and maybe plastic pants and a very skimpy outfit that would allow people to see everything, I'm not sure what, maybe a school girl or maid outfit or something. Then drag/roll her around some public place full of people and let all the vibes and enema go. Once she's full up and there's a crowd gathered, deflate the plug and have her mess and cum in front of everyone. Maybe get some kind of public use thing going after that I'm not sure.
Obviously not feasible for sexual assault reasons, and even if you did find a willing participant, at bare minimum it's still public lewdness and indecent exposure. Even somewhere where everyone was into this kind of thing like Capcon, I don't think that sort of thing would fly. Best I could ever conceivably hope for would be doing it with someone who was into this at a party/orgy, and I know that's never going to happen in a million years.