There's also the plateau key model that is only available (in affordable form) from Noblet. I know of at least two sax players who have bought them for just that very reason.
I take a slightly different approach to the finger hole problem when I had students who played sax and who I force fed clarinet playing to at an early age. Instead of the candy-ass plateau horns, I would start them on the bargain basement Vito student sopranos. To this day, you can (with careful shopping) pick these up for under $50.00 through a variety of sources (pawn shops, thrift shops and the like). Purchase a decent mouthpiece and you're ready to go.
The small finger holes on the Vitos were sized to fit grade school aged girls hands, and were much more forgiving than a standard soprano clarinet, and the investment in a Vito horn was literally nothing compared to any of the alternatives. Then, once they mastered the tricky (for a sax player) finger hole problem, they could move up to a "real" clarinet, preferably a Selmer product of course.
Regarding the Noblet horns, I was once told by an "insider" that the Noblet horns were the less than cosmetically perfect standard Leblanc horns. The badging did not take place until late in the assembly process. Certainly, the fit and finish on Noblets has always been better than that on the few Signets I've seen over the past forty years.