I would try to find a good local leather smith who you can work with in person and have them handle the specific items you want to fit in the belt; I believe there are some good leather smiths in Texas. If that doesn't work I think there are some guys on the forum who could maybe make one.
Welcome to KKF!
Though this thread is probably not the place for this question. You should maybe start a new thread for this question and perhaps introduce yourself in the New Member Check-In area.