Absolutely Mark....collectors or any kind of enthusiasts on history and weapons will have their preferences and chosen fields of study, often very selective and 'purist' , but I think the most fascinating are the anomalies and variations . There's where the real historical detection come in!
As we know on the baskethilts, the instance with the Highlander who killed Blackbeard in 1715 using his broadsword in the melee on the decks of the pirate's vessel, he was probably one of the regular troops locally who joined Maynard's naval group in this ambush.
I have found however, a couple of instances where Highland basket hilts were included among noted arms used on pirate vessels. The National Maritime Museum could not specify nor confirm such use of these on ships, but if I recall such instances could not be categorically excluded . I think you're right, Annis might have mentioned one, now Im fired up too!!
Off to the notes.
All the best
Jim