Chris,
My explanation, and maybe I am too direct:
Someone had this special made at Reklus (or another similar shop - there are some in Italy), with cheap parts, using a B10S platform. Then it came to Europe (remember Mecanicimport) 15 years ago. Someone, not the manufacturer, but the then owner, invented the Conrero barchetta monicker.
Maybe he could not register it, or he just wanted to make a quick profit. And now (and for the last 10 years) that poor car does the rounds, now "finally restored", which means a new coat of paint.
But maybe someone has a better explanation!