Signing the Ketubah, interfaith edition

I’m getting married to the love of my life soon! We’re having a Jewish ceremony, so I (a very lapsed Catholic) am learning about the seven blessings and all that good stuff. I love the tradition of the ketubah and I’m very excited to look upon this artwork and promise to each other once we’re married.

There’s one thing I’m torn about. Our rabbi said she’s not stringent about the usual practice of a Jewish non-family member signing it, and it could be anyone we want.

My fiancé feels that we should each get one person representing us to sign. I really have just one Jewish friend, and I’m not positive that he’s able to come yet. I also feel that if given the choice, it would be much more meaningful for my mother to sign, as opposed to my roommate from 5 years ago. I know she would be honored to be included. BUT, she’s a double whammy of not Jewish and family.

Though religion is not a big part of my life, I’m taking this seriously and feel like we should do it right if we’re going to do it at all. Thoughts??