The CB200 inlet manifolds come with vacuum take off as a standard, and will fit the 175 engine. They are some 5mm shorter than the 175 parts.
I drilled and tapped a pair of 175 manifolds, as shown in pics below. ( note the badly routed clutch cable ) To get a decent depth of hole to tap, I drilled diagonally at the thickest part of the flange, taking great care not to break through into the O ring groove.
Is it worth it ? Probably not, I tried balancing the carbs once using my Morgan Carbtune gauge, haven't bothered since, as I think that so long as both throttle slides open at the same time that's probably all that needs to done. Not like a 4 cylinder bike with CV carbs. I suppose you could tweak the air screws to get it pulling the same vacuum on both cylinders ?
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