I always felt like the torque spec was too high on those risers. I always used a torque wrench, but would chicken out every time before it clicked - it just seemed like too much for that screw.
Anyway, this really doesn't seem like a big problem. I'll bet you could even just drill and tap it for a screw one size larger. Do both sides if you are anal....
But I would definitely try the thread insert first. If it holds torque, it is fine! And if you screw it up, it is only a $200 mistake. Chicken feed in the world of Ducati ownership.
2000 750SSie (gone but not forgotten)
2006 Sport 1000 Track Bike. Yellow, cannister-ectomy (duh...), 14 / 41 gearing, DP ECU, Arrow 2-1 full system, Traxxion Dynamics fork springs and AK-20 cartridges, Penske 8983 rear shock, frame and axle sliders, Wasp PUK, Wasp TMSD, XT MiniLap timer, ugly 3-spoke Brembo wheels, Brembo 4p / 4p calipers with Spiegler lines, Dunlop Q2s, Airtech track fairing, Shorei LiFePo 14, and a DP slipper clutch....and now I'm finished...no, really.....