I wouldn't have thought this would be too hard to do

One, big zip file, with all of the textures and an edited aircraft config (existing repaints can be easily added again, if anyone has them). Users must be sure not to edit the names of the folders, or any of the config entries, to ensure that everyone sees things correctly. If everyone does it correctly, there should be no fuss.
Emailing it to each individual racer (and don't forget the judges) would be extremely time consuming, compared to just uploading it once at SimV, without going through the trouble of getting everyones email address, and making sure everyone has it.