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Don't wanna make a mass reply, but I had a troll "grabblel" build a few years ago made out of a 90s Huffy with comfort geo that I put drops and 650Bs on, but it used the crummy BMX side pulls the bike came with.
Eventually the poor mechanical advantage of the brakes ovalized the pivots on the brake levers (and I had sheared a few cable heads off in the meantime) and the non-standard BB cups started to go so I turned it back into a cruiser and sold it.
In any case 650B wheels worked great, I loved that ride despite the cheapness. But to do it "right" you would need an early 90s racey bike of the kind that rides well with a long stem, that has the cable stop you need to run V-brakes at the back, that also has the brake pivots fairly high up so the brake pads can reach the rim (and they have to be V-brakes because most cantis can't go up by much), and ofc a 650B rim brake wheelset which these days is sort of an oddball unless you build them yourself. Or one of those 700D bikes that were actually 650B.