not saying one way is right or one way is wrong but after thinking about it .
The one thing i would say is do not use anything as a garnish that will change the taste of the meat it touchs.
You want every judge to get the same exact taste when they take a bite.
I know in my first post i said you could use fruit as a garnish but i don't think i would.
if you use a citrus fruit that will add a taste to any meat that it contacts
same w/ the vinegar in a slaw.
Lettuce is a neutral (no real flavor)
If you have to dress it up .Maybe a apple slice or 2 as most of us (and the judges ) are used to apple smoked food . The only thing w/ apple slices is they would have to be added right b4 turn in as they will turn brown.
I would just stick w/ some greenery and let the meat speak for itself