TBF the fibre lead in is smaller in diameter than cat5, and with a little care and attention can be installed very neat and tidily.
The smallest duct I can find is 12 x 8mm cross-section, although a D-section at 16 x 8mm may be more visually acceptable. The details for EZ-bend that I found on-line gave diameters of 3mm and 4.8mm for the rugged versions, and I assume that the OR version is the same or comparable. At those sizes it should be possible to accommodate several feeds.
Words of encouragement are always gratefully received!