Fred, if you do fab your disc, I'd bore it to fit a reduced section on the hub. The "true" shoulder on the hub will let you press in the hub to keep them concentric in both planes while you tack, then weld both sides.
Both hub and disc should be oversize to allow clean-up turning to true, as the welding will warp the disc.
The weld is then only asked to serve as torque transfer and "keeper", the disc being mechanically borne on the hub.
With the bore and all surfaces then turned mechanically true and therefore symmetrical about the bore, a 9" disc at 1725 shouldn't require any balancing.
Bob
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