Do 135MM Campy (or Compatible) Hubs exist? If not, what are my
options for a 135MM touring wheel?

1. Use Shimano hub/cassette w/ Campy Ergos/R.Derailleur?
2. Convert an old 135MM Campy 8s MTB hub to a 9/10s freehub? Is this
possible?
3. Buy a 135MM axle for the current crop of Campy 9/10 hubs? Do
these exist?
4. Other options?

Thanks!