hmm, not really in my eyes
i would not want to be running it with the input shaft not fully engaged with the clutch plates, as the clutch splines will be designed to deliver that torque over the whole width of a clutch plate, so you may find it rounds the end off the shaft, or the clutch plate splines themselves could fail, which is probably the more likely as they are fairly soft in comparison to the input shaft
why do you need a twin plate? as like you say the torque rating is ‘overkill’ a single with a decent spring rate would be plenty imo, and have room in the box