I'd just let them see, but make them temporarily go blind every time they'd be about to see something they care about, or are in a dangerous situation where being able to see would be useful.
Next time you're stuffing fistfuls of delicious bacon into your mouth, you might want to consider sticking a piece or two of crispy goodness into your crotch, then up your butt for good measure.
Disclaimer: I'm not an expert. I invite you to correct me if you know better. Sources are at the end.
If you see taste receptors as chemosensors, then yes. We have those all over the place. In the lungs, brain, kidneys, the gastrointestinal system etc.. Even in sperm. Although a lot of those are not well studied yet, it has been found that - depending on the cells and region - they can serve specific purposes, like metabolic regulation, or airway relaxation. Basically a way for you body to react to chemical signals. However, afaik they do not contribute to the taste sensation when you're eating. (Except of those in your mouth, tongue and nose of course.) So you don't need to go all Cartman style.
But(t), a lot of those findings have limited validity, e.g., because of investigations using cell cultures instead of in vivo studies, or because several animals have a different (or even completely lacking) set of those receptors than humans.
I think people will figure something out when they begin to study the magical limb disappearing event and they find out you're the only person alive who was unaffected.
People will have to rationalize your existence somehow. Being unable to ignore that you're the one person left on the planet with 4 limbs, everyone you meet now immediately labels you a freak and you find yourself ousted from society.
I am sure the mystery of disappearing limbs will FAR overtake the one person who wasn't affected. Worldwide panic and who knows what else. You could also wish 99% of people lose a random limb, and that would mean 70 million people would still have all their limbs.
There was a one shot sequel to Death Note where a dude got it, then decided it was more trouble then it was worth, and sold it via auction where the funds would be split up amongst all the accounts at his bank created before a certain date. The U.S. led by not-Trump won with a several trillion bid, and the dude got killed for breaking a new rule that immediately showed up in the book banning its sale.