I don't think so... we're planning on doing the same thing! We are making it very casual though (bbq) and stressing, please no gifts - we just want an opportunity to celebrate with everyone!
have you planned this with your resort? I'm vegetarian and even asking for mine and a few of the guest's meals to be vegetarian was like pulling teeth to them! But for your family - I'm sure they would be happy to try it! I know I'd love to go to a vegan wedding!!