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I think I understand what you're suggesting using a retaining washer instead of the shiny red knob, It might be enough.
But I am basically in the same predicament as the PZ30B pump actuator fouling on the same spot and looking for obscure inlet manifold angles for any possible clearance.
Also I had the oposite issue you had with fitment as the manifold studs I use are too long and butt into the bottom of Nibbi near the choke plunger so it's finicky all round...
the frame was built around the 200cc sized engines and 26mm carbs...the 250 makes everything a shoehorn..
with the right sort of manifold angle these carbs would fit fully functional out of the box.
Even if I get it to fit without the idle knob I don't think I have access to the choke plunger anyway.
Probably going to take the shipping hit and return the Nibbi.
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