If there was room for the 28" wheel, possibly without using a mudguard, and there probably is, I'd keep the larger wheel and use an adapted large diameter hydraulic disc brake. The mount ends of the disc centre would need to be cut off, the disc centred and new mount holes drilled, bolt threads tapped into the motor shell or end cap. I'd already investigated this way of mounting a disc and it's quite possible.
An easy alternative is fork end extensions, only an inch long and perfectly possible.
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An easy alternative is fork end extensions, only an inch long and perfectly possible.
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