@LeahJesse Thanks for reaching out! This sounds like a really incredible honeymoon trip!
Due to the technical nature and high risk of setting up a rope system like this, we (at REI) cannot provide guidance to help with your set-up; further, although you may receive suggestions from other members in the community, per our User Guidelines, please "remember that you assume all risk associated with engaging in any activities or using any equipment discussed in this community. Your situation, experience, or knowledge may vary from that of the individual who is sharing an idea or solution. Some advice you find here may even be wrong."
We encourage you to look up a rock climbing guiding service that has permits from the land agency that manages Looking Glass Arch. A professional guide service will be the best way to safely experience all the arch has to offer.
Hope this helps!