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Very picturesque I am afraid, especially the Via del Sale that starts after the col di Tende, very nice stretch the stretch before La Brigue as well, and the gorges in France before getting to Sospel and then again down to Sainte-Agnes.
If you really want to cut it short, you could ride from Sospel to Ventimiglia and then take a train back to Turin.
Whatever you decide, do not cut out the Via Del Sale.
Close to booking tickets. Can't decide on departure from Nice or Turin though. I'd prefer to fly out of Turin for practical reasons. Possibility to store the bikebag and other stuff during the ride. How picturesque is the last stretch from around Borgo san dalmasso / Cuneo, to Nice? That's where i'd be turning around towards turin again.