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Rear is worth rebuilding but the front probably not so much given the price of a replacement vs rim & build combined. Also the front bearings are more susceptible to wear as they are not sealed (although the rear bearings aren’t that much better unless you pack more grease in on delivery).
I learned to build my own wheels by virtue of how quickly Brompton rims wear through if you ride reasonable urban distances every day in all weathers.
Give it a go!
Any recommendations for Brompton wheel builders in London? I’ve worn through my rims...