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OK... A thought I'd been entertaining (but haven't taken time to try yet) is mounting a lightweight (fiberglass, potentially) disc via the center cap of the alloy wheel... I'd seen on another site that folks sometimes use "knock out seals" (see pic; found at Home Depot and other home centers) as center caps... With the disc attached to the center cap (using a "stand-off" (metal tube) through which you put a bolt (such as a carriage bolt so the curved surface of the disc isn't broken)), you could attach the disc to the alloy wheel without having to drill into the wheel. Plus it should be relatively easy to pop off whenever necessary.
The key would be to have a well balanced disc and to have a good way to center the disc on the center cap so it doesn't wobble. Being able to snug the disk up against the wheel a bit would help also (maybe use those little stick-on "rubber feet" on the disc where it would touch the wheel).
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