Seems fair to compare crank-based PMs based on arms, spindle and spider and not rings, since those can be swapped. Yes DM rings throw this off, since you lose the spider but then have to adjust with the rings, but I'm not sure there are any crank-based PMs that actually use DM rings (e.g. with the SISL2, you add a PM spider and use normal rings, not DM rings) so I think arms + spindle + spider is a fair way to look at this.
So if those are the ground rules, I believe your Origin would weight approx. 532g (I'm deducting 130g for the Shimano rings). That is just an estimate - I am sure one of you knows the numbers better than I do.
For a SISL2 PM, my research estimates 250g for the arms, 64g for the spindle, and assuming we go with a P2Max NG (not ECO), 157g in 110BCD. That adds up to 471g, or approx 61g less than the Origin. Not sure if the SRM spider for Cannondale cranks is more or less than the 157g for the ECO, so there may be an even lighter SISL2 option yet.