I wonder if wheels from a kids mountain bike would fit? They are 24" (507mm), compared to the 550A having 490mm, so only 8.5mm greater radius.
I know most such bikes are on the cheap and nasty end of the scale, but it might be something to think about. Kenda make a slick high pressure tyre in this size (TRM48 $25.95)
I prefer old bikes in original condition, but if I come across another shocker it could be a prospect for experimental wheel transplants.
Another one in France, classified ads on ebay, notice single speed, no front rack, looks like the rear tyre has been replaced, 95 euros:
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