Don't know about hte other departments except that what ytou say about KCSO is true and that the part about the WSP is partly true.
WSP is THE most professional law enforcement agancy in this state. They are educated about open carry and do not make a big deal out of it, even on the capital grounds.
Check around and you will find almost unanimous agreement that they do not, as a general rule, take your gun for officer safety. They definitely do not qualify as "hostile".
A bad encounter with WSP over your weapon, assuming nothing else squirrely about the stop, is a rare thing.