#5 !!
Partially due to family dietary restrictions and preferences, and partially due to weberitis
there is no issues with this.
Grills for chicken/veggies don't see pork/beef.
Grills for pork/beef don't see chicken/veggies.
Smoker doesn't see chicken/veggies (other than ABTs).
Gasser doesn't see pork/beef.
I usually scrape the grates after the cook, and then again once warmed up for next cook.