Hi Kevin,
In your main mac HD go to library>Application Support>Final Cut Pro System Support>Custom Settings>Kona3 Easy Setups. In this folder there is all of your Kona 3 east set ups.
I have not tried this... but you may be able to remove (and save somewhere else where you can find them later) the easy set ups you wish to remove.
You may also need to trash your pref in FCP so it forces FCP to go through the process of indexing them again. Otherwise they may still show up in your easy setup drop down.
Getting them back
should be as simple as doing this in reverse. But I cant guarantee it. ;)
Richard Cooper
FrostLine Productions, LLC
Anchorage, Alaska
http://www.frostlineproductions.com