What you are calling a choke switch is a choke lever? The lever is locked in position by a spring and ball pressing into the detent plate on the lever. The spring and ball are not replacable (you can't buy them from Honda) however, they might be part of the choke lever set (16025-HM3-L00) about $23. I don't know because I've never had to replace one. They don't wear out and they are not damaged during normal use. The only way you can ever need one is if it is lost by an untrained mechanic and those parts do not need to be removed for normal service.
400 carbs are known for this. its been a while but if you look where the choke lever rotates there is a small metal plate with a couple holes in it. there should be a little pin that sticks out of the plastic lever that grabs in the holes in the metal plate to hold the choke lever in different positions. the pin wears a little and doesn't grab. you can remove the little metal plate and bend it slightly so it applys more pressure on the pin thats on the lever.
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