Cut piece the length to wrap the radius(you do the math, piXdiameter/4, take a v router bit and groove it out every 1/2" or so on the backside leaving 2mm of thickness at front(yes, that will leave a bunch of grooves that runout about 3/4 of the way down the molding FInd something same radius, steam the face and wrap around said object using a strap. Glue and fill when dry. *Even if it cracks, you'll be a lot closer to the form of the molding.
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