Yes, when I swapped my crank pulley I saw the stock one had a rubberized component in it. I agree, the stock clutch/fly does a lot of damping, too. I would not worry at all about a lightweight crank pulley.
A slightly different matter will be when I need to upgrade my clutch/fly for the TT with said Competition Clutch kit. I will still have spring loaded clutch disk but no more dual mass flywheel. Damping will be compromise to some degree.
Given hat I never read about harmonics induced crankshaft failures I take the risk.