I think it is reasonable in that this is a party in your honor. My good friend keeps kosher and when she invited me to a potluck in her home, I brought something that fit in with her kosher guidelines (I don't actually keep a kosher kitchen, but I did the best I could). Her home, her party, her dietary preferences go. Even though I don't follow those guidelines, it certainly doesn't hurt me to eat a kosher meal when I am in her home. If I were to host a party in her honor, I would request that all the food be kosher because I would want to have food that the guest of honor could eat and enjoy. To me this is exactly the same issue. I wouldn't just randomly have a party and insist that everything be kosher because she was invited, but I would if the party was specifically for her.
Me (39) DH (46) & furbabies * m/c 7/08 4/12 11/12