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are you trying not to have to rebuild the rear wheel with a track hub? there are wheelsets in silver (with a freehub'd rear wheel) on ebay for £87.88 posted that could also be of interest?
Other than that give SJS a call and ask what 650b rims they have in stock, they have some that are about £15, so if you pick up a no name track hub on here for £10 is then spokes and build you'd get a relatively budget rear wheel...
You going to run fixed with a rear brake? otherwise a disc rear rim would be fine?
Fixed 650b idea for steamroller on a budget.
Can anyone recommend any good wheelsets ideal for conversion? Before I try this Decathlon option - https://www.decathlon.co.uk/p/27-5-double-walled-v-brake-mountain-bike-rear-wheel-with-freewheel-and-nut/_/R-p-196999?mc=8515100