I think you need to put a definition to the term "Swimbait". Once you put a definition to the term "Swimbait" you can eliminate and allow many baits.
The term "Swimbait" is so broad. Swim is movement in water, bait is to draw a fish in by smell, movement or sight. Just about every lure does that. Cast and slowly reel in a nightcrawler, am I swimming in a bait, therefore I'm throwing a "Swimbait". I think after you put a definition to the term "Swimbait" you will be able to apply your rules.
I just feel the definition is very important now the the swimbait craze is, well, crazy.
There are sure to be plenty more tournaments in the future that will be "Swimbait only". Or maybe they will leave out the term "Swimbait". The upcoming Casitas tournament is not using the term "Swimbait" or is it?