I've just sorted them, thanks to the advice on here and from Ben Jemison.
I used a circular, thin blade-disc on a Dremel to cut the wheels - taking off the portion from the innermost edge to the first ridge. Then I smoothed down the remaining ridge to make the wheel surface flat.
No inserts but a carefully applied dab of glue between the bead of the tyre and the edges of the wheel.
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