I have done a quick search as I have 60mm hose on our Athena. Megaflex seem to do it in UK:
Alternatively, talk to local charter
company as they must have to replace them on their FPs.
While the newer FPs may use smaller dia, I would be very wary of using a reducer to use smaller more easily available hose, you really dont want a blockage there!
Good luck, that big black hose looks a bar steward to take off and manipulate!
Be interested on how you get on as mine can not be put off much longer!