Superglue can work for small parts, but I would not trust it for large.? Keep in mind that the tool force on the rim of a 6" disc is SIX TIMES that of a 1" disc.? And an interrupted cut could send your part flying.? Don't risk ruining your part for an experiment.
I'll add one suggestion for workholding, that of drilling and tapping the backside to hold the part to the faceplate while machining the front and rim.? You're likely to have spokes, so much of the material is going to disappear anyway.? And once spokes are created other means to mount the part to the faceplate are obvious.
Mike
