Someone is working on a UCGO "carrier" module based on the 20 TEU cargo size for the XR-5 (holds 4 UCGO). That, or something like it, could be attached to the existing space elevator. A similar module could be made for UMMU (although it may be better to maybe use UMMUFA on the existing transports).
I suspect the best solution would be to make an invisible module that gets attached to the Space Elevators personnel cars, and one each for GEO station and the Hotel, etc. Perhaps a trick from UMMFB to enable transfer from the cars to the stations, etc.