With big cassette gearing, should be the right O.L.D.! The problem with Broms has always been their narrower standard. However, notice a) thru axles (for disc brake safety), and b) nothing slotted or eccentric to provide chain tension, so dummy-derailleur might be needed for that, but then again, is also necessary for chain tension in folding. Can you get Alfine hubs with a thru-axle? (and disc brake, I've seen one with their roller brake and after doing a deep dive on that, passed on the bike despite low price used, the hills here would wear it out too quick).