The imitations of things have the same look but you don't have the sentimental connection to the plastic version. For this reason I tend to agree with MaTaLa. If you are ok with the difference in weight between the pottery and whatever would be the alternative sink, and if you are willing to make reasonable accommodations to protect it from being banged and broken, and if you will not be crushed yourself if it does get cracked despite your best efforts, then I'd say it's worth trying.
Also, as Roamer brought up, you can get a bucket to use for drainage, and then use your bowl for storage and prep anywhere in your van instead of of having it permanently mounted on top of a countertop. You could even bring your portable sink outside for food prep purposes. The image that comes up in my mind is scrubbing up dinner veggies against a backdrop of the beautiful place you're parked. And perhaps having a portable basin would be easier to protect while moving v. mounting it permanently in place.
~angie
Sent from my VS501 using Tapatalk