Not sure I like that. I'm not altogether keen on people messing with other author's characters (Flashman excepted, of course).
"Treasure Island" is one of those books that I just love, and have done for years. While I'd like to see more of the Long John, I'm a bit nervous of him being in someone else's hands.
So generally I would run a mile from this type of thing, but if you say it's good maybe I'll give it a go.
(If it turns out not to be good, then I shall put you in one of my games in 28mm form, and make sure you get killed.)