Name: greene Savannah, GA (Sunset 28) (Zone 8b) I have no use for internet bullies!
Or you could limit your swap participants to people who live in the colder climates and don't plan on starting their seeds early. That may work and will allow you more wiggle room on the dates. One plus to that is the seeds would be suitable for similar climates.
Sunset Zone 28, AHS Heat Zone 9, USDA zone 8b~"Leaf of Faith"