I don't think that any aircraft type that can operate into Alderney would fit the requirement - as I understand it, the Tris simply carried the rods in the cabin (which of course the Dornier could also do), but this is no longer permitted regulation-wise. So it is somewhat pointless to blame Aurigny for replacing the Tris with a Dornier unless the business-owner has come up with a novel plan how a 50seater turboprop with a sufficiently large cargo hold can be introduced to ACI...
Just wondering - how is Alderney connected to the outside world in addition to scheduled flights? Groceries etc. certainly will be shipped to the island and how is the ever increasing number of mail order delivieries dealt with? Even if ships do not go back and forth on a daily basis, this certainly must be an alternative way to ship fishing rods instead of closing down an otherwise burgeoning (?) business...